1. Department of Obstetrics and Gynecology, Cathay General Hospital, Taipei, Taiwan, ROC
2. Institute of Clinical Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan, ROC
3. Department of Medicine, Cheng-Hsin General Hospital, Taipei, Taiwan, ROC
4. Department of Nursing, Oriental Institute of Technology, New Taipei City, Taiwan, ROC