1. Department of Gastroenterology, School of Medicine, Shanghai East Hospital, Tongji University, Shanghai 200120, China
2. Division of Digestive Surgery, Department of General Surgery, Medical School, Hospital de Clínicas de Porto Alegre, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
3. Department of Surgery, Tokyo Metropolitan Cancer and Infectious Diseases Center, Komagome Hospital, 3-18-22 Honkomagome, Bunkyo-ku, Tokyo 113-8677, Japan
4. Department of Surgery, Clinical Sciences, Lund, Skåne University Hospital and Lund University, 22185 Lund, Sweden