1 Department of Nursing, Oriental Institute of Technology, New Taipei City, Taiwan, ROC.
2 Department of Medicine, Cheng-Hsin General Hospital, Taipei, Taiwan, ROC; Department of Nursing, Oriental Institute of Technology, New Taipei City, Taiwan, ROC.
3 Department of Obstetrics and Gynecology, Taipei Veterans General Hospital, Taipei, Taiwan, ROC; Department of Obstetrics and Gynecology, National Yang-Ming University, Taipei, Taiwan, ROC; Institute of Clinical Medicine, National Yang-Ming University, Taipei, Taiwan, ROC. Electronic address: phwang@vghtpe.gov.tw.