1. Division of Gastroenterology and HepatologyNational Center for Global Health and Medicine Tokyo Japan
2. Division of Gastroenterology and Hepatology, Integrative Center of Internal MedicineGunma University Hospital Maebashi Japan
3. Division of Gastroenterology, Department of Internal MedicineCatholic Kwandong University College of Medicine, International St. Mary's Hospital Incheon South Korea
4. Gastroenterology Unit, Department of Translational Research and New Technologies in Medicine and SurgeryUniversity of Pisa Pisa Italy
5. Department of Upper Gastrointestinal Tract DisordersClinical Scientific Centre Moscow Russia
6. Gastroenterology Unit, Department of Surgery, Oncology and GastroenterologyUniversity of Padua Padua Italy
7. Division of Gastroenterology and HepatologyStanford University Stanford California