1. Wingate Institute of Neurogastroenterology, Blizard Institute, Barts and The London School of Medicine and Dentistry Queen Mary University of London London UK
2. Department of Gastroenterology Osaka City University Graduate School of Medicine Osaka Japan
3. Division of Gastroenterology Washington University School of Medicine St. Louis Missouri USA
4. Division of Gastroenterology, Hepatology and Nutrition University of Louisville Louisville Kentucky USA
5. Gastroenterology Unit Department of Translational Research and New Technologies in Medicine and Surgery University of Pisa Pisa Italy