[1] Iran Univ Med Sci, Hlth Management Res Inst, Nursing & Midwifery Care Res Ctr, Rashid Yasemi St,Valiasr Ave,POB 19395-4798, Tehran, Iran
[2] Shahid Beheshti Univ, Family Res Inst, Tehran, Iran
[3] Tabriz Univ Med Sci, Fac Nursing & Midwifery, Dept Midwifery, Tabriz, Iran
[4] Tufts Sch Med, Dept Publ Hlth & Community Med, Boston, MA USA