“…The number of participants in each study ranged from 15 to 176. Of these studies, 10 were randomized controlled trials [ 22 , 24 , 26 , 27 , 30 , 45 , 47 , 51 , 52 , 54 ] and 24 were non-randomized studies (2 prospective cohort studies [ 28 , 36 ] and 22 retrospective comparative analyses [ 23 , 25 , 29 , 31 - 35 , 37 - 44 , 46 , 48 - 50 , 53 , 55 ]). Thirty studies were published full articles [ 22 - 31 , 33 - 38 , 39 - 43 , 45 - 47 , 49 - 54 ] and 4 were conference abstracts [ 32 , 39 , 44 , 48 ].…”