1. Department of Obstetrics and Gynecology; Yuan's General Hospital; No. 162, Chenggong 1st Rd. Kaohsiung 802 Taiwan
2. Department of Nursing, Mackay Memorial Hospital; No. 92, Sec. 2, Chungshan N. Rd. Taipei 104 Taiwan
3. School of Nursing; College of Nursing; Taipei Medical University; No. 250, Wuxing St. Taipei 110 Taiwan