“…We excluded 42 duplicates and 181 articles that did not satisfy the selection criteria, and then reviewed the remaining 15 studies. 5,[11][12][13][14][15][16][17][18][19][20][21][22][23][24] After excluding six studies for irrelevancy (n = 3), 11,18,22 insufficient data (n = 1), 12 and identical study populations (n = 2), 15,17 we were left with nine studies, which were included in the final analysis. 5,13,14,16,[19][20][21]23,24 Of these, eight studies reported the preventive efficacy, 13,14,16,[19][20][21]23,24 three reported the treatment efficacy 5,14,19 and two studies reported both.…”