[1] Univ Tehran Med Sci, Sch Publ Hlth, Dept Epidemiol & Biostat, Tehran, Iran
[2] Islamic Azad Univ, Sch Adv Sci, Dept Cell & Mol Biol, Med Branch, Tehran, Iran
[3] Pasteur Inst Iran, Res Ctr Emerging & Reemerging Infect Dis, Dept Epidemiol & Biostat, Tehran, Iran
[4] Kermanshah Univ Med Sci, Nursing & Midwifery Sch, Student Res Comm, Kermanshah, Iran
[5] Iran Univ Med Sci, Hazrat E Rasool Hosp, Minimally Invas Surg Res Ctr, Tehran, Iran