1. Department of Obstetrics and Gynecology, Faculty of Medicine, Universitas Airlangga/Soetomo General Hospital, Surabaya, Indonesia
2. School of Midwifery, Faculty of Medicine, Universitas Airlangga, Surabaya, Indonesia
3. Medical Study Program, Faculty of Medicine, Airlangga University, Surabaya, Indonesia
4. East Java Provincial Health Office, Surabaya, Indonesia