“…The available fulltext articles were screened on inclusion and exclusion criteria and assessed for eligibility. Together with articles identified through searches in reference lists of previously retrieved reviews and the gray literature, this resulted in 64 articles, describing 66 different studies (28 RCTs, 3,7,13,16,19,21,32, 33,39,47,50,54,56e58,61,62,66,69,72,78,83,85,93,98,111,121,124 18 non-RCTs, 1,2,6,11,15,20,27,35,44,51,55,65,74,75,82,89,96,104 and 20 before-after comparisons (BAs) 8 articles of McMahon and Kederis described 2 different studies. 57,58,70,71 The 66 included studies were published between 1964 and 2018, and 37 (56.1%) of them were published in the last decade (2008e2018) 1e3, 13,15,16,19e21,27,28, 30,32,33,35,39,40,43,46,51,54,62,65,69e71,73e75,78,82,83,85,89,91,96,98,104,110,111,124 ( Table 1).…”