“…Visual analogue scale. Regarding the type of VAS used, 79 % (n 23) of acute studies used the pen and paper method (6)(7)(8)11,13,14,20,22,24,(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)40,43) , 10 % (n 3) used electronic VAS (18,21,23) and three studies did not specify the type of scale used (15,19,25) . Of the twenty-three studies using pen and paper scales, fifteen used 100 mm scales (6,14,20,22,24,26,27,(30)(31)(32)(33)(34)(35)(36)43) , while eight used 150 mm scales (7,8,11,13,28,29,...…”