1 Department of Obstetrics and Gynecology, Medicine College of Medicine, National Taiwan University, Taipei, Taiwan. Electronic address: wumh@twcxr.org.tw.
2 Health Promotion Administration, Ministry of Health and Welfare, Taipei, Taiwan. Electronic address: lilian@hpa.gov.tw.
3 Health Promotion Administration, Ministry of Health and Welfare, Taipei, Taiwan. Electronic address: oboe@hpa.gov.tw.