investigacion

Publications

NCD Risk Factor Collaboration (NCD-RisC). Diminishing benefits of urban living for children and adolescents' growth and development. Nature. 2023 ;615(7954):874-883. doi: 10.1038/s41586-023-05772-8.

Blanco-Morillo J, Salmerón Martínez D, Morillo-Cuadrado DV, Arribas-Leal JM, Puis L, Verdú-Verdú A, Martínez-Molina M, Tormos-Ruiz E, Sornichero-Caballero A, Ramírez-Romero P, Farina P, Cánovas-López S. Hematic Antegrade Repriming Reduces Emboli on Cardiopulmonary Bypass: A Randomized Controlled Trial. ASAIO J. 2023 1;69(3):324-331. doi: 10.1097/MAT.0000000000001776.

Iglesias Gómez C, González Sequeros O, Salmerón Martínez D. Clinical reasoning evaluation using script concordance test in primary care residents. An Pediatr (Engl Ed). 2022 ;97(2):87-94. doi: 10.1016/j.anpede.2022.06.005.

Soriano López J, Salmerón Martínez D, García Pina R, Humberto Gómez J, Sánchez Rodríguez I, Ballesta Ruíz M, Chirlaque López MD. COVID-19 exposure setting, social and gender determinants in a mediterranean region. Rev Esp Salud Publica. 2022 19;96:e202212091.

Guevara M, Molinuevo A, Salmerón D, Marcos-Gragera R, Carulla M, Chirlaque MD, Rodríguez Camblor M, Alemán A, Rojas D, Vizcaíno Batllés A, Chico M, Jiménez Chillarón R, López de Munain A, de Castro V, Sánchez MJ, Ramalle-Gómara E, Franch P, Galceran J, Ardanaz E. Cancers (Basel). Cancer Survival in Adults in Spain: A Population-Based Study of the Spanish Network of Cancer Registries (REDECAN). 2022 15;14(10):2441. doi: 10.3390/cancers14102441.

Salmerón et al. Respond to “Future Directions for Predicting Rare Cancer Rates”. Salmerón D, Botta L, Martínez JM, Trama A, Gatta G, Borràs JM, Capocaccia R, Clèries R; Information Network on Rare Cancers (RARECARENet) Working Group. Am J Epidemiol. 2022 19;191(3):503-504. doi: 10.1093/aje/kwab286.

Salmerón D, Botta L, Martínez JM, Trama A, Gatta G, Borràs JM, Capocaccia R, Clèries R; Information Network on Rare Cancers (RARECARENet) Working Group. Estimating Country-Specific Incidence Rates of Rare Cancers: Comparative Performance Analysis of Modeling Approaches Using European Cancer Registry Data. Am J Epidemiol. 2022 19;191(3):487-498. doi: 10.1093/aje/kwab262.

Blanco-Morillo J, Arribas-Leal JM, Farina P, Fernández-González AL, Sornichero-Caballero Á, Ramírez-Romero P, Chen TN, Salmerón-Martínez D, Cánovas-López SJ. Hematic Antegrade Repriming: A Reproducible Method to Decrease the Cardiopulmonary Bypass Insult. J Extra Corpor Technol. 2021 ;53(1):75-79. doi: 10.1182/ject-2000043.

NCD Risk Factor Collaboration (NCD-RisC). Worldwide trends in hypertension prevalence and progress in treatment and control from 1990 to 2019: a pooled analysis of 1201 population-representative studies with 104 million participants. Lancet. 2021 Sep 11;398(10304):957-980. doi: 10.1016/S0140-6736(21)01330-1. Epub 2021 Aug 24.

Salmerón D. Bayesian beta nonlinear models with constrained parameters to describe ruminal degradation kinetics, Journal of Applied Statistics, 2021. DOI: 10.1080/02664763.2021.1913105.

NCD Risk Factor Collaboration (NCD-RisC). Heterogeneous contributions of change in population distribution of body mass index to change in obesity and underweight. Elife. 2021 Mar 9;10:e60060. doi: 10.7554/eLife.60060.

Legaz I, Bernardo MV, Alfaro R, Martínez-Banaclocha H, Galián JA, Jimenez-Coll V, Boix F, Mrowiec A, Salmeron D, Botella C, Parrado A, Moya-Quiles MR, Minguela A, Llorente S, de la Peña-Moral J, Muro M. PCR Array Technology in Biopsy Samples Identifies Up-Regulated mTOR Pathway Genes as Potential Rejection Biomarkers After Kidney Transplantation. Front Med (Lausanne). 2021 17;8:547849. doi: 10.3389/fmed.2021.547849. eCollection 2021.

Morán-Sánchez I, Bernal-López MLÁ, Salmerón D, Pérez-Cárceles MD. Correlates of preferring a passive role in decision-making among patients with schizophrenia or bipolar disorder. Patient Educ Couns. 2021;104(5):1125-1131. doi: 10.1016/j.pec.2020.10.019.

Cirera L, Ballesta M, Márquez-Calderón S, Chirlaque MD, Saez M, Salmerón D; Mortality working group of the Spanish Epidemiological Association. Partial contributions and temporal trends of leading causes of death during the last four decades in Spain. Public Health. 2020; 189:81-90. doi: 10.1016/j.puhe.2020.08.023.

Ruiz-Roca JA, Donoso-Martínez B, Ameneiros-Serantes S, Martínez-Beneyto Y, Salmerón-Martínez D, Gay-Escoda C. Influence of operator's professional experience in the postoperative course after surgical extrac-tion of the impacted lower third molar: A pilot study. J Clin Exp Dent. 2020 1;12(9):e805-e812. doi: 10.4317/jced.56549.

NCD Risk Factor Collaboration (NCD-RisC). Height and body-mass index trajectories of school-aged children and adolescents from 1985 to 2019 in 200 countries and territories: a pooled analysis of 2181 population-based studies with 65 million participants. Lancet. 2020 7;396(10261):1511-1524. doi: 10.1016/S0140-6736(20)31859-6.

Navarro-Mateu F, Salmerón D, Vilagut G, Husky M, Ballesta M, Chirlaque MD, Huerta JM, Martínez S, Navarro C, Alonso J, Nock M, Kessler RC. Childhood adversities and suicidal behavior in the general population. The cross-sectional PEGASUS-Murcia Project. Rev Psiquiatr Salud Ment (Engl Ed). 2020 21:S1888-9891(20)30116-6. doi: 10.1016/j.rpsm.2020.10.002.

NCD Risk Factor Collaboration (NCD-RisC). Repositioning of the global epicentre of non-optimal cholesterol. Nature. 2020;582(7810):73-77. doi: 10.1038/s41586-020-2338-1.

Santonja F, Salmerón D, Osuna E, García-Alberola A, Sánchez A, Martínez Beneyto Y. (2020). Tres semanas de docencia virtual en la Universidad de Murcia (I): Experiencias en Medicina y Odontología. Revista Española De Educación Médica, 1(1), 40-46. https://doi.org/10.6018/edumed.428331

Husky MM, Bharat C, Vilagut G, Salmerón D, Martínez S, Navarro C, et al. Birth-sex cohort alcohol use transitions in the general population: the cross-sectional PEGASUS-Murcia project. Adicciones. 2020 Apr 1;32(2):94–104.

NCD Risk Factor Collaboration. National trends in total cholesterol obscure heterogeneous changes in HDL and non-HDL cholesterol and total-to-HDL cholesterol ratio: a pooled analysis of 458 population-based studies in Asian and Western countries. Int J Epidemiol. 2020;49:173–92.

Salmerón D, Gómez García F, Pons-Fuster E, Pérez-Sayáns M, Lorenzo-Pouso AI, López-Jornet P. Screening for prediabetes and risk of periodontal disease. Diabetes Metab Syndr. 2019 Apr;13(2):1661–6.

Fernández-Caballero M, Salmerón D, Dolores Chirlaque M, Chen-Liang TH, Hurtado AM, García Malo MD, et al. Increasing therapy-related myeloid neoplasms in multiple myeloma. Eur J Clin Invest. 2019 Feb;49(2):e13050.

Navarro-Mateu F, Escámez T, Quesada MP, Alcaráz MJ, Vilagut G, Salmerón D, et al. Modification of the risk of post-traumatic stress disorder (PTSD) by the 5-HTTLPR polymorphisms after Lorca’s earthquakes (Murcia, Spain). Psychiatry Res. 2019;282:112640.

Navarro-Mateu F, Quesada MP, Escámez T, Alcaráz MJ, Seiquer de la Peña C, Salmerón D, et al. Childhood adversities and 5-HTTLPR polymorphism as risk factors of substance use disorders: retrospective case-control study in Murcia (Spain). BMJ Open. 2019 04;9(9):e030328.

NCD Risk Factor Collaboration (NCD-RisC). Rising rural body-mass index is the main driver of the global obesity epidemic in adults. Nature. 2019;569(7755):260–4.

Ray-Coquard I, Trama A, Seckl MJ, Fotopoulou C, Pautier P, Pignata S, et al. Rare ovarian tumours: Epidemiology, treatment challenges in and outside a network setting. Eur J Surg Oncol. 2019;45(1):67–74.

Pasquali S, Bonvalot S, Tzanis D, Casali PG, Trama A, Gronchi A, et al. Treatment challenges in and outside a network setting: Soft tissue sarcomas. Eur J Surg Oncol. 2019;45(1):31–9.

Orlandi E, Alfieri S, Simon C, Trama A, Licitra L, RARECAREnet Working Group. Treatment challenges in and outside a network setting: Head and neck cancers. Eur J Surg Oncol. 2019;45(1):40–5.

Nicolai N, Biasoni D, Catanzaro MA, Colecchia M, Trama A, RARECAREnet Working Group. Testicular germ-cell tumours and penile squamous cell carcinoma: Appropriate management makes the difference. Eur J Surg Oncol. 2019;45(1):60–6.

Lykoudis PM, Partelli S, Muffatti F, Caplin M, Falconi M, Fusai GK, et al. Treatment challenges in and outside a specialist network setting: Pancreatic neuroendocrine tumours. Eur J Surg Oncol. 2019;45(1):46–51.

Imbimbo M, Maury J-M, Garassino M, Girard N, RARECAREnet Working Group. Mesothelioma and thymic tumors: Treatment challenges in (outside) a network setting. Eur J Surg Oncol. 2019;45(1):75–80.

Gatta G, Trama A, Capocaccia R, RARECARENet Working Group. Epidemiology of rare cancers and inequalities in oncologic outcomes. Eur J Surg Oncol. 2019;45(1):3–11.

Cano JA, Iniesta M, Salmerón D. Integral priors for Bayesian model selection: how they operate from simple to complex cases. TEST. 2018 Dec 1;27(4):968–87.

Marcos-Gragera R, Solans M, Galceran J, Fernández-Delgado R, Fernández-Teijeiro A, Mateos A, et al. Childhood and adolescent lymphoma in Spain: incidence and survival trends over 20 years. Clin Transl Oncol. 2018 Oct;20(10):1289–301.

Cirera L, Salmerón D, Martínez C, Bañón RM, Navarro C. [More than a decade improving medical and judicial certification in mortality statistics of death causes]. Rev Esp Salud Publica. 2018 Jun 6;92.

NCD Risk Factor Collaboration (NCD-RisC). Contributions of mean and shape of blood pressure distribution to worldwide trends and variations in raised blood pressure: a pooled analysis of 1018 population-based measurement studies with 88.6 million participants. Int J Epidemiol. 2018 Jun 1;47(3):872–883i.

Cano JA, Carazo C, Salmerón D. Objective Bayesian model selection approach to the two way analysis of variance. Comput Stat. 2018 Mar 1;33(1):235–48.

Chirlaque MD, Salmerón D, Galceran J, Ameijide A, Mateos A, Torrella A, et al. Cancer survival in adult patients in Spain. Results from nine population-based cancer registries. Clin Transl Oncol. 2018 Feb;20(2):201–11.

Botta L, Capocaccia R, Trama A, Herrmann C, Salmerón D, De Angelis R, et al. Bayesian estimates of the incidence of rare cancers in Europe. Cancer Epidemiol. 2018;54:95–100.

NCD Risk Factor Collaboration (NCD-RisC). Worldwide trends in body-mass index, underweight, overweight, and obesity from 1975 to 2016: a pooled analysis of 2416 population-based measurement studies in 128·9 million children, adolescents, and adults. Lancet. 2017 Dec 16;390(10113):2627–42.

Pérez-Romero S, Gascón-Cánovas JJ, Salmerón-Martínez D, Parra-Hidalgo P, Monteagudo-Piqueras O. [Relevance of the socioeconomic and health context in patient satisfaction]. Gac Sanit. 2017 Oct;31(5):416–22.

Galceran J, Ameijide A, Carulla M, Mateos A, Quirós JR, Rojas D, et al. Cancer incidence in Spain, 2015. Clin Transl Oncol. 2017 Jul;19(7):799–825.

Marcos-Gragera R, Galceran J, Martos C, de Munain AL, Vicente-Raneda M, Navarro C, et al. Incidence and survival time trends for Spanish children and adolescents with leukaemia from 1983 to 2007. Clin Transl Oncol. 2017 Mar;19(3):301–16.

Matz M, Coleman MP, Carreira H, Salmerón D, Chirlaque MD, Allemani C, et al. Worldwide comparison of ovarian cancer survival: Histological group and stage at diagnosis (CONCORD-2). Gynecol Oncol. 2017 Feb;144(2):396–404.

Gatta G, Capocaccia R, Botta L, Mallone S, De Angelis R, Ardanaz E, et al. Burden and centralised treatment in Europe of rare tumours: results of RARECAREnet-a population-based study. Lancet Oncol. 2017;18(8):1022–39.

NCD Risk Factor Collaboration (NCD-RisC). Worldwide trends in blood pressure from 1975 to 2015: a pooled analysis of 1479 population-based measurement studies with 19·1 million participants. Lancet. 2017 07;389(10064):37–55.

Chirlaque M-D, Uhry Z, Salmerón D, Sánchez-Zapata M-I, Zannoni GF, Navarro C, et al. Trends in net survival from ovarian cancer in six European Latin countries: results from the SUDCAN population-based study. Eur J Cancer Prev. 2017;26 Trends in cancer net survival in six European Latin Countries: the SUDCAN study:S107–13.

Bromet EJ, Atwoli L, Kawakami N, Navarro-Mateu F, Piotrowski P, King AJ, et al. Post-traumatic stress disorder associated with natural and human-made disasters in the World Mental Health Surveys. Psychol Med. 2017;47(2):227–41.

Navarro-Mateu F, Salmerón D, Vilagut G, Tormo MJ, Ruíz-Merino G, Escámez T, et al. Post-Traumatic Stress Disorder and other mental disorders in the general population after Lorca’s earthquakes, 2011 (Murcia, Spain): A cross-sectional study. PLoS ONE. 2017;12(7):e0179690.

Pérez-Romero S, Gascón-Cánovas JJ, Salmerón-Martínez D, Parra-Hidalgo P, Monteagudo-Piqueras O. [Sociodemographic characteristics and geographic variability associated with patient satisfaction in Primary Care]. Rev Calid Asist. 2016 Oct;31(5):300–8.

Patiño-Villena B, Chirlaque MD, Salmerón D, González E, Navarro C. [Validity of anthropometric measurements and weight perceptions reported by relatives of children under 4 years old]. Gac Sanit. 2016 Aug;30(4):300–3.

Huerta JM, Chirlaque MD, Tormo MJ, Buckland G, Ardanaz E, Arriola L, et al. Work, household, and leisure-time physical activity and risk of mortality in the EPIC-Spain cohort. Prev Med. 2016 Apr;85:106–12.

Cano JA, Carazo C, Salmerón D. Linear contrasts for the one way analysis of variance: A Bayesian approach. Statistics & Probability Letters. 2016 Feb 1;109:54–62.

Assi N, Moskal A, Slimani N, Viallon V, Chajes V, Freisling H, et al. A treelet transform analysis to relate nutrient patterns to the risk of hormonal receptor-defined breast cancer in the European Prospective Investigation into Cancer and Nutrition (EPIC). Public Health Nutr. 2016 Feb;19(2):242–54.

Marí-Dell’Olmo M, Gotsens M, Palència L, Rodríguez-Sanz M, Martinez-Beneito MA, Ballesta M, et al. Trends in socioeconomic inequalities in mortality in small areas of 33 Spanish cities. BMC Public Health. 2016 29;16:663.

Sánchez JAC, Martínez DS. A Review of the Developments on Integral Priors for Bayesian Model Selection? BEIO, Boletín de Estadística e Investigación Operativa. 2016;32(2):96–112.

Francisci S, Minicozzi P, Pierannunzio D, Ardanaz E, Eberle A, Grimsrud TK, et al. Survival patterns in lung and pleural cancer in Europe 1999-2007: Results from the EUROCARE-5 study. Eur J Cancer. 2015 Oct;51(15):2242–53.

Salmerón D, Cano JA, Chirlaque MD. Reducing Monte Carlo error in the Bayesian estimation of risk ratios using log-binomial regression models. Stat Med. 2015 Aug 30;34(19):2755–67.

Tormo M-J, Salmerón D, Colorado-Yohar S, Ballesta M, Dios S, Martínez-Fernández C, et al. [Results of two surveys of immigrants and natives in Southeast Spain: health, use of services, and need for medical assistance]. Salud Publica Mex. 2015 Feb;57(1):38–49.

Merritt MA, Tzoulaki I, Tworoger SS, De Vivo I, Hankinson SE, Fernandes J, et al. Investigation of dietary factors and endometrial cancer risk using a nutrient-wide association study approach in the EPIC and Nurses’ Health Study (NHS) and NHSII. Cancer Epidemiol Biomarkers Prev. 2015 Feb;24(2):466–71.

Salmerón D, Cano JA, Robert CP. OBJECTIVE BAYESIAN HYPOTHESIS TESTING IN BINOMIAL REGRESSION MODELS WITH INTEGRAL PRIOR DISTRIBUTIONS. Statistica Sinica. 2015;25(3):1009–23. R functions

Navarro-Mateu F, Tormo MJ, Salmerón D, Vilagut G, Navarro C, Ruíz-Merino G, et al. Prevalence of Mental Disorders in the South-East of Spain, One of the European Regions Most Affected by the Economic Crisis: The Cross-Sectional PEGASUS-Murcia Project. PLoS ONE. 2015;10(9):e0137293.

Manzanares A, Menayo R, Segado F, Salmerón D, Cano JA. A probabilistic model for analysing the effect of performance levels on visual behaviour patterns of young sailors in simulated navigation. Eur J Sport Sci. 2015;15(3):203–12.

Chirlaque MD, Moldenhauer F, Salmerón D, Navarro C. [Trend pattern of the incidence of thyroid cancer in Murcia Region (Spain) from 1984 to 2008]. Gac Sanit. 2014 Oct;28(5):397–400.

Navarro-Mateu F, Tormo M, Vilagut G, Alonso J, Ruíz-Merino G, Escámez T, et al. Epidemiology and genetics of common mental disorders in the general population: the PEGASUS-Murcia project. BMJ Open. 2013 Dec 3;3(12):e004035.

Moreno López AB, Ballesta Ruiz M, Salmerón Martínez D, Navarro Sánchez C, Tormo Díaz MJ. [Influence of double workload in perceived health and health services utilization of immigrants and Murcian natives, Spain]. Rev Esp Salud Publica. 2013 Aug;87(4):351–66.

Cano JA, Carazo C, Salmerón D. Bayesian model selection approach to the one way analysis of variance under homoscedasticity. Comput Stat. 2013 Jun 1;28(3):919–31.

Salmerón D, Cirera L, Ballesta M, Navarro-Mateu F. Time trends and geographical variations in mortality due to suicide and causes of undetermined intent in Spain, 1991-2008. J Public Health (Oxf). 2013 Jun;35(2):237–45.

Espín Ríos MI, Pérez Flores D, Sánchez Ruíz JF, Salmerón Martínez D. [Prevalence of childhood obesity in the Murcia Region; an assessment of different references for body mass index]. An Pediatr (Barc). 2013 Jun;78(6):374–81.

Cano JA, Salmerón D. Integral Priors and Constrained Imaginary Training Samples for Nested and Non-nested Bayesian Model Comparison. Bayesian Anal. 2013 Jun;8(2):361–80.

Huerta JM, Tormo M-J, Chirlaque M-D, Gavrila D, Amiano P, Arriola L, et al. Risk of type 2 diabetes according to traditional and emerging anthropometric indices in Spain, a Mediterranean country with high prevalence of obesity: results from a large-scale prospective cohort study. BMC Endocr Disord. 2013 Feb 6;13:7.

Colorado-Yohar S, Tormo MJ, Salmerón D, Dios S, Ballesta M, Navarro C. Violence reported by the immigrant population is high as compared with the native population in southeast Spain. J Interpers Violence. 2012 Nov;27(16):3322–40.

Salmerón D, Chirlaque MD, Isabel Izarzugaza M, Sánchez MJ, Marcos-Gragera R, Ardanaz E, et al. Lung cancer prognosis in Spain: the role of histology, age and sex. Respir Med. 2012 Sep;106(9):1301–8.

Marcos-Gragera R, Salmerón D, Izarzugaza I, Ardanaz E, Serdà B-C, Larrañaga N, et al. Trends in prostate cancer survival in Spain: results from population-based cancer registries. Clin Transl Oncol. 2012 Jun;14(6):458–64.

Martinez-Beneito MA, García-Donato G, Salmerón D. A Bayesian Joinpoint regression model with an unknown number of break-points. Ann Appl Stat. 2011 Sep;5(3):2150–68.

Gavrila D, Salmerón D, Egea-Caparrós J-M, Huerta JM, Pérez-Martínez A, Navarro C, et al. Prevalence of metabolic syndrome in Murcia Region, a southern European Mediterranean area with low cardiovascular risk and high obesity. BMC Public Health. 2011 Jul 14;11:562.

Peris-Bonet R, Salmerón D, Martínez-Beneito MA, Galceran J, Marcos-Gragera R, Felipe S, et al. Childhood cancer incidence and survival in Spain. Ann Oncol. 2010 May;21 Suppl 3:iii103-110.

Chirlaque MD, Salmerón D, Ardanaz E, Galceran J, Martínez R, Marcos-Gragera R, et al. Cancer survival in Spain: estimate for nine major cancers. Ann Oncol. 2010 May;21 Suppl 3:iii21-29.

Gavrila D, Antúnez C, Tormo MJ, Carles R, García Santos JM, Parrilla G, et al. Prevalence of dementia and cognitive impairment in Southeastern Spain: the Ariadna study. Acta Neurol Scand. 2009 Nov;120(5):300–7.

Martínez-Teruel A, Megías MD, Hernández F, Madrid J, Salmerón D, Cano JA. Objective Bayesian vs. least squares estimation for by-products degradability with different rumen fluids. Can J Anim Sci. 2009 Jun 1;89(2):273–7.

Salmerón D, Cirera L, Saez M, Navarro C. Influence of the introduction of the ICD-10 on tendencies of mortality by causes (1980-2004). Gac Sanit. 2009 Apr;23(2):144–6.

Cano JA, Salmerón D, Robert CP. Integral equation solutions as prior distributions for Bayesian model selection. TEST. 2008 Nov 1;17(3):493–504.

Cirera Suárez L, Martínez López C, Salmerón Martínez D, Navarro Sánchez C. [Perinatal mortality underreporting in obstetrics and neonatology]. An Pediatr (Barc). 2008 Aug;69(2):129–33.

García Santos JM, Gavrila D, Antúnez C, Tormo MJ, Salmerón D, Carles R, et al. Magnetic resonance spectroscopy performance for detection of dementia, Alzheimer’s disease and mild cognitive impairment in a community-based survey. Dement Geriatr Cogn Disord. 2008;26(1):15–25.

Cano JA, Salmerón D. Objective Bayesian Analysis of an Exponential Regression Model with Constrained Parameters Applied to Animal Digestibility. Communications in Statistics - Theory and Methods. 2007 Oct 3;36(13):2463–73.

Cano JA, Kessler M, Salmerón D. Integral priors for the one way random effects model. Bayesian Anal. 2007 Mar;2(1):59–67.

Martínez DS, Suárez LC, de Torres M, Grupo COMPARA. [Comparability ratios of the total and by sex between ICD-9 and ICD-10 for the mortality lists of Murcia and the National Institute of Statistics of Spain]. Rev Esp Salud Publica. 2007 Feb;81(1):53–5.

Cano JA, Salmerón D. APLICACIÓN DE UN ANÁLISIS ESTADÍSTICO BAYESIANO OBJETIVO DE UN MODELO DE REGRESIÓN NO LINEAL A LA COMPARACIÓN DE LAS PROPORCIONES TOTALES DEGRADADAS DE VARIOS ALIMENTOS. Anales de Veterinaria de Murcia. 2007;23:19–23.

Cano JA, Kessler M, Salmerón D. Approximation of the posterior density for diffusion processes. Statistics & Probability Letters. 2006 Jan 1;76(1):39–44.