Affiliation: | (1) Department of General Surgery and Center of Minimal Invasive Gastrointestinal Surgery, Southwest Hospital, The Third Military Medical University, Gaotanyan Street 30, Shapingba District, Chongqing, 400038, China;(2) Department of Health Statistic, The Third Military Medical University, Gaotanyan Street 30, Shapingba District, Chongqing, 400038, China |