1. Department of Obstetrics and Gynecology, Shuang Ho Hospital, Taipei Medical University, Taipei, Taiwan.
2. Division of Infertility, Department of Obstetrics and Gynecology, Taipei Medical University Hospital, Taipei, Taiwan.
3. Department of Public Health, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan.
4. School of Public Health, College of Public Health, Taipei Medical University, Taipei, Taiwan.
5. Department of Obstetrics and Gynecology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan.