1. Helicobacter pylori and Microbiota Study Group Institute of Tropical Disease, Universitas Airlangga Surabaya Indonesia
2. Department of Anatomy, Histology and Pharmacology, Faculty of Medicine Universitas Airlangga Surabaya Indonesia
3. Department of Internal Medicine, Faculty of Medicine Universitas Muhammadiyah Surabaya Surabaya Indonesia
4. Department of Physiology and Medical Biochemistry, Faculty of Medicine Universitas Airlangga Surabaya Indonesia
5. Division of Gastroenterology, Department of Internal Medicine, Faculty of Medicine University of Indonesia Jakarta Indonesia
6. Department of Internal Medicine, Faculty of Medicine Universitas Sumatera Utara Medan Indonesia
7. Department of Environmental and Preventive Medicine Oita University Faculty of Medicine Yufu Japan
8. Department of Medicine, Gastroenterology and Hepatology Section Baylor College of Medicine Texas Houston USA
9. Division of Gastroentero‐Hepatology, Department of Internal Medicine, Faculty of Medicine‐Dr. Soetomo Teaching Hospital Universitas Airlangga Surabaya Indonesia