1. Departments of Obstetrics and Gynecology, Taichung Veterans General Hospital, Taichung, Republic of China
2. Chung Shan Medical University, Chung Shan Medical University Hospital, Taichung, Republic of China
3. Department of Statistics, Tung Hai University, Taichung, Republic of China
4. Department of Obstetrics and Gynecology, Changhua Christian Hospital, Changhua, Republic of China
5. Department of Urology, Taipei Veterans General Hospital, Taipei, Taiwan, Republic of China