1. Department of Epidemiology Shiraz University of Medical Sciences Shiraz Iran
2. Center for Health Related Social and Behavioral Sciences Research Shahroud University of Medical Sciences Shahroud Iran
3. Department of Complex Genetics and Epidemiology School of Nutrition and Translational Research in MetabolismMaastricht University Maastricht The Netherlands
4. School of Nursing and Midwifery Shahid Beheshti University of Medical Sciences Tehran Iran
5. Department of Epidemiology and Biostatistics University of California San Francisco San Francisco CA USA
6. Shiraz HIV/AIDS Research CenterInstitute of HealthShiraz University of Medical Sciences Shiraz Iran