1. Department of Preventive Medicine University of Santiago de Compostela Santiago de Compostela Spain
2. HIV/STI Surveillance Research Center, and WHO Collaborating Center for HIV Surveillance Institute for Futures Studies in Health Kerman University of Medical Sciences Kerman Iran
3. Department of Epidemiology and Biostatistics School of Public Health Tehran University of Medical Sciences Tehran Iran
4. Centro de Investigación Biomédica en Red de Epidemiología y Salud Pública (CIBER‐ESP Madrid Spain