Department of General Surgery, Beijing Friendship Hospital,Capital Medical University, Beijing 100050, China;
Department of General Surgery, Beijing Friendship Hospital,Capital Medical University, Beijing 100050, China;
Department of General Surgery, Beijing Tiantan Hospital, Capital Medical University, Beijing 100050, China;
Department of General Surgery, Beijing Friendship Hospital,Capital Medical University, Beijing 100050, China;
Department of General Surgery, Beijing Friendship Hospital,Capital Medical University, Beijing 100050, China;
Department of General Surgery, Beijing Friendship Hospital,Capital Medical University, Beijing 100050, China;