1. Department Obstetrics and Gynecology, Faculty of Medicine, Universitas Airlangga, Surabaya, Indonesia
2. Department Obstetrics and Gynecology, DR. Soetomo General Academic Hospital, Surabaya, Indonesia
3. Department Obstetrics and Gynecology, Universitas Airlangga Hospital, Surabaya, Indonesia
4. Department Obstetrics and Gynecology, Dr. Moewardi General Hospital, Faculty of Medicine Universitas Sebelas Maret, Solo, Indonesia
5. Department Obstetrics and Gynecology, Lyell-McEwin Hospital, The University of Adelaide, Adelaide, Australia