1. Department of Obstetrics and Gynecology, Inje University College of Medicine, Ilsan-Paik Hospital, Gyeonggi, South Korea;
2. Department of Obstetrics and Gynecology, College of Medicine, Inje University, Sanggye Paik Hospital, Seoul, South Korea;
3. Department of Nursing, The Graduate School of Inha University, Incheon, South Korea