1. Department of Preventive Medicine, Taiwan Adventist Hospital, No. 424, Section 2, Bade Road, Songshan District, Taipei 105, Taiwan
2. Department of Health Care Management, National Taipei University of Nursing and Health Sciences, No. 89, Nei-Chiang Street, Wanhua District, Taipei 10845, Taiwan
3. Department of Obstetrics and Gynecology, Taiwan Adventist Hospital, No. 424, Section 2, Bade Road, Songshan District, Taipei 105, Taiwan
4. Department of Obstetrics and Gynecology, National Taiwan University Hospital, No. 7, Zhongshan S. Road, Zhongzheng District, Taipei 100, Taiwan