“…Of the total of 10,923 references that were initially screened, 7640 had no duplicates and 7306 were rejected at the title and abstract stage. We analyzed 334 studies that were identified for potential inclusion and full-text review, and 30 comparisons were entered into the analysis 16 , 17 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 ( Figure 1 ). Of the 30 comparisons, only 1 study targeted elderly people undergoing hemodialysis.…”