“…16-21 , 24 The most reported prophylactic groups were preoperative (8/11 studies), 14 -16 , 18 -20 , 22 , 24 followed by postoperative (7/11 studies), 16 -21 , 24 and intraoperative (3/11 studies). 16,17,23 There was one prospective randomized trial 17 and ten retrospective cohort studies. 14 -16 , 18 -24 Eight studies were performed in the United States, 14 , 15 , 18 , 20 -24 one in Korea, 19 one in Japan, 16 and one in Denmark.…”