Results: intraoperative blood loss: median 7ml (1 - 60ml); Operating time: median 18 minute (10 - 45 minute); rate of primary bleeding need to manage: 1, 4% (2/142), Rates of secondary bleeding after the first 24 hours postoperatively need to manage 0.7% (1/142), Median postoper ative pain scores: to rely on questionaire completed by the patient during the next 3 weeks after operate: day 1: 4 (1 - 8); day 2: 3 (1 - 8); day 3: 3 (0 - 7); day 4: 2, 75 (0 - 6) day 5: 2, 5 (0 - 6); day 6: 2 (0 - 6); day 7: 1, 8 (0 - 6), Time of return to a nearly normal diet (soft foods): 3, 12 ngày (1 - 8) và time of return to a normal diet: 6, 80 ngày (3 - 17); the day each patient return to work normaly: 6, 26 (1-12).