1. Sue & Bill Gross School of Nursing, University of California at Irvine, CA, US
2. Counseling and Reproductive Health Research Centre, Department of Midwifery, School of Gorgan Nursing and Midwifery, Golestan University of Medical Sciences, Gorgan, Iran
3. Department of Biostatistics, Loma Linda University, LA, CA, US
4. Department of Reproductive Health and Midwifery, Nursing Care Research Center (NCRC), School of Nursing and Midwifery, Iran University of Medical Sciences, Tehran, Iran