1. Department of Obstetrics and Gynaecology, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong SAR
2. Department of Midwifery, College of Medicine and Health Sciences, Debre Markos University, Ethiopia
3. Department of Midwifery, College of Medicine and Health Sciences, Injibara University, Ethiopia
4. LI Ka Shing Institute of Health Sciences; Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong SAR