1. Doctoral Program of Medical Science, Faculty of Medicine, Universitas Airlangga, Surabaya, Indonesia
2. Division of Gastroentero-Hepatology, Department of Internal Medicine, Faculty of Medicine, Universitas Airlangga, Surabaya, Indonesia
3. Internal Medicine Department, Faculty of Medicine, Universitas Airlangga, Surabaya, Indonesia
4. Department of Medical Microbiology, Faculty of Medicine, Universitas Airlangga, Surabaya, Indonesia
5. Department of Gastroenterology, Dhaka Medical College and Hospital, Dhaka, Bangladesh
6. Helicobacter pylori and Microbiota Study Group, Institute Tropical Disease, Universitas Airlangga, Surabaya, Indonesia