1. Department of Obstetrics and Gynecology, Kuo General Hospital, Tainan, Taiwan, ROC
2. Department of Obstetrics and Gynecology, Taipei Veterans General Hospital, Taipei, Taiwan, ROC
3. Institute of Clinical Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan, ROC
4. Department of Nursing, Taipei Veterans General Hospital, Taipei, Taiwan, ROC