1. 1Miyagi Cancer Center, Department of Surgery, 47-1 Nodayama, Natori 981-1293, Japan ; ;
2. 2Miyagi Cancer Center, Department of Surgery, 47-1 Nodayama, Natori 981-1293, Japan
3. 3Miyagi Cancer Center, Department of Gastroenterology, 47-1 Nodayama, Natori 981-1293, Japan
4. 4Tohoku University Graduate School of Medicine, Department of Surgery, 1-1 Seiryo-machi, Sendai 980-8574, Japan