1. Department of Gastroenterology/Internal Medicine Graduate School of Medicine, Gifu University Gifu Japan
2. Health Administration Center, Gifu University Gifu Japan
3. Department of Physical Medicine and Rehabilitation University of Michigan Ann Arbor Michigan USA
4. Department of Brain Sciences, Centre for Vestibular Neurology Imperial College London London UK
5. Miwa Clinic, Gastroenterology and Hepatology Gifu Japan
6. Department of Internal Medicine Nishimino Kosei Hospital Gifu Japan