Perea-Bartolome et al. BMC Public Health 2011, 11:504 http://www.biomedcentral.com/1471-2458/11/504 Author details 1Departamento de Psicología Básica, Psicobiología y Metodología de las Ciencias del Comportamiento. Facultad de Psicología. Universidad de Salamanca. Salamanca, Spain. 2Primary care research unit of La Alamedilla Health Center, Castilla y León Health Service - SACYL. Salamanca, Spain. 3Departamento de Estadística. Universidad de Salamanca. Salamanca, Spain. Authors’ contributions Conception of the idea for the study: MVP, RGG, ERS and VLF. Development of the protocol, organization and funding: MVP, ERS, RGG, VLF, SMS, CPA, TJA, CAC, MPM. Writing of the manuscript: MVP, ERS, RGG, VLF, and SMS. All the authors have read the draft critically, to make contributions, and have approved the final text. Competing interests The authors declare that they have no competing interests. Received: 7 June 2011 Accepted: 27 June 2011 Published: 27 June 2011 References 1. 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