1. Department of Respiratory Medicine Iizuka Hospital Fukuoka Japan
2. Department of Physiology Hyogo College of Medicine Nishinomiya Japan
3. Department of Respiratory Medicine Juntendo University Graduate School of Medicine Tokyo Japan
4. Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (Ciberehd) Instituto de Salud Carlos III Barcelona Spain
5. Gastrointestinal Motility Laboratory, Department of Surgery, Hospital de Mataró, Consorci Sanitari del Maresme Universitat Autònoma de Barcelona Mataró Spain
6. Department of General Medicine Iizuka Hospital Fukuoka Japan