“…Valid studies (n=75, 88%) c [28,30,32,40,43,48,52,59,63,64,69,71,77,80,83,86,97,99,104,109] 20 (27) <6 months [31, 33, 36-39, 41, 45-47, 49-51, 55-57, 61, 62, 65, 68, 74-76,78, 81, 84, 85, 87, 88, 92, 95, 96, 100-102, 107, 108, 111] 38 (51) 6-11 months [23,29,34,35,42,44,53,79,93,98 Unapplicable studies d a In 3 (4%) studies, the study design was a randomized controlled trial (RCT) cross-over; the follow-up period was defined as the overall study duration including the washout period for cross-over studies. b Number of studies and percentages were presented.…”