1. Department of Regenerative Surgery; Fukushima Medical University; 1 Hikariga-oka Fukushima 960-1295 Japan
2. Department of Surgery; Fukushima Prefectural Aizu General Hospital; 10-75 Shiromae Aizuwakamatsu Fukushima 965-8555 Japan
3. Division of Gastric Surgery; Shizuoka Cancer Center; 1007 Shimonagakubo, Nagaizumi-cho Sunto-gun Shizuoka 411-8777 Japan
4. Department of Internal Medicine; Fukushima Prefectural Aizu General Hospital; 10-75 Shiromae Aizuwakamatsu Fukushima 965-8555 Japan
5. Department of Gastroenterology and Rheumatology; Fukushima Medical University; 1 Hikariga-oka Fukushima 960-1295 Japan