1. Department of Health Sciences Prefectural University of Hiroshima Minami‐ku Hiroshima Japan
2. Department of Nutrition, Graduate School of Human Life and Ecology Osaka Metropolitan University Habikino‐shi Osaka Japan
3. Department of Nutritional Medicine, Graduate School of Human Life and Ecology Osaka Metropolitan University Sumiyoshi‐ku Osaka Japan
4. Department of Gastroenterological Surgery, Graduate School of Medicine Osaka Metropolitan University Abeno‐ku Osaka Japan
5. Department of Surgery Osaka Saiseikai Nakatsu Hospital Kita‐ku Japan
6. Institute of Gastroenterology Tokyo Women's Medical University Sinjuku‐ku Tokyo Japan