1. Junpukai Health Maintenance Center‐Kurashiki OkayamaJapan
2. Junpukai Health Maintenance Center OkayamaJapan
3. Department of Health Care Medicine Kawasaki Medical School OkayamaJapan
4. Cancer Detection Center Miyagi Cancer Society MiyagiJapan
5. National Hospital Organization Hakodate National Hospital Hokkaido Japan
6. Division of Gastroenterology Department of Internal Medicine 2 Kawasaki Medical School OkayamaJapan