1. School of Reproduction Health, Faculty of Medicine of Universitas Airlangga, Mayjen Prof. Dr. Moestopo 47, Pacar Kembang, Surabaya, Jawa Timur 60132, Indonesia
2. Department of Obstetrics and Gynaecology, Faculty of Medicine-Dr. Soetomo Teaching Hospital, Universitas Airlangga, Mayjend Prof. Dr. Moestopo No. 6 - 8, Airlangga, Gubeng, Kota Surabaya, Jawa Timur 60285, Indonesia
3. Department of Physiology, Faculty of Medicine of Universitas Airlangga, Mayjen Prof. Dr. Moestopo 47, Pacar Kembang, Surabaya, Jawa Timur 60132, Indonesia
4. Gastroentero- Hepatology Division, Department of Internal Medicine, Faculty of Medicine-Dr. Soetomo Teaching Hospital-Institute of Tropical Disease, Universitas Airlangga, Mayjend Prof. Dr. Moestopo No. 6 - 8, Airlangga, Gubeng, Kota Surabaya, Jawa Timur 60285, Indonesia
5. Department of Epidemiology, Faculty of Medicine, Universitas Airlangga, Mayjen Prof. Dr. Moestopo 47, Pacar Kembang, Surabaya, Jawa Timur 60132, Indonesia