1. Department of Obstetrics & Gynaecology, Faculty of Medicine, Prince of Wales Hospital The Chinese University of Hong Kong Hong Kong China
2. Department of Obstetrics and Gynaecology, Centre for Health Education and Health Promotion, The Jockey Club School of Public Health and Primary Care, Faculty of Medicine The Chinese University of Hong Kong Hong Kong China
3. Reproduction and Development Laboratory, Li Ka Shing Institute of Health Science The Chinese University of Hong Kong Hong Kong China