1. University of the Basque Country; Department of Preventive Medicine and Public Health; GIU 10/24, Barrio Sarriena S/N Leioa Bizkaia Spain 48940
2. University of the Basque Country, and Centre for Biomedical Research Network on Mental Health (CIBERSAM); Department of Neuroscience, Psychiatry Section; Barrio Sarriena S/N PO Box 699 Leioa Spain E-48080
3. University of the Basque Country; Department of Neuroscience, Psychiatry Section; UPV-EHU PO Box 699 Leioa Spain E-48080
4. Hospital de Cruces Osakidetza, Servicio Vasco de Salud; Molecular Genetics Laboratory; Plaza de Cruces s/n Baracaldo Bizkaia Spain 48903
5. IIB Sant Pau; Iberoamerican Cochrane Centre; Sant Antoni Maria Claret 171 Edifici Casa de Convalescència Barcelona Catalunya Spain 08041