Intraoperative data outcomes
bleeding
BLEEDING
Preserved group had a shorter No.253 lymph nodes dissection time (15.7 ± 4. 2 min vs. 26.0 ± 3. 6 min, 
Operative outcomesOperative time was defined as the time from incision to skin closure. No.253 lymph nodes dissection time was defined as the time between the start of lymph node dissection at No.253 lymph nodes and the end of regional dissection. Operative bleeding was obtained from the perioperative care record sheet.