1. Child and Adolescent Psychiatry Department; Instituto de Investigación Sanitaria Gregorio Marañón, IiSGM, Hospital General Universitario Gregorio Marañón; CIBERSAM; Madrid; Spain
2. Department of Psychiatry; Universidad Autónoma de Madrid; Hospital Universitario de la Pricesa; CIBERSAM; Madrid; Spain
3. Department of Health Statistics and Informatics; World Health Organization; Geneva; Switzerland