“…Of the 14 papers which clearly explained these methods, 10 (71.4%) 2,3,27,29,33,37,[39][40][41][42] also provided the details of the subjects from whom evaluations were obtained (item 13). Ten studies (50%) [27][28][29][30][34][35][36]39,41,42 did not report separately the productivity changes (item 14), and in the papers where costs and benefits were not discounted, no explanation was given except for one study 40 (item 25). Only four studies (20%) 2,28,31,36 did not clearly describe the methods followed to estimate resources used and their unit costs (item 17), and eight evaluations (40%) 2,27,28,30,34,37,39,41 did not report them separately (item 16).…”