“…After analyzing all the studies included in the integrative review, eight experimental studies were found, six of which were randomized clinical trials (level of evidence 2) 12 , 13 , 14 , 15 , 16 , 17 and two non-randomized ones (level of evidence 3) 18 , 19 ; eighteen observational studies (level of evidence 4) 5 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 ; and six case studies (level of evidence 5), 36 , 37 , 38 , 39 , 40 , 41 according to the classification used. 11 …”