1. Department of Obstetrics and Gynaecology; Ramathibodi Hospital; Mahidol University; Bangkok Thailand
2. Department of Nursing; Ramathibodi Hospital; Mahidol University; Bangkok Thailand
3. Research Center; Faculty of Medicine; Ramathibodi Hospital; Mahidol University; Bangkok Thailand
4. Department of Pharmacology; Faculty of Medicine Siriraj Hospital; Mahidol University; Bangkok Thailand