1. Department Obstetrics & Gynecology, Faculty of Medicine, Universitas Airlangga, Surabaya, Indonesia
2. Department Obstetrics & Gynecology, Dr. Soetomo General Academic Hospital, Surabaya, Indonesia
3. Department Obstetrics & Gynecology, Universitas Airlangga Hospital, Surabaya, Indonesia
4. Department Obstetrics & Gynecology, Lyell McEwin Hospital, The University of Adelaide, Elizabeth Vale, Australia