“…The data sources were clearly defined in all studies; however, three papers did not state the time frame for data [26, 47, 59]. Of the 33 studies, 29 clearly stated the eligibility criteria, but 16 did not explain the rationale for these criteria [ 26, 28, 34, 39, 45, 47-49, 51, 52, 54, 55, 57, 60, 64]. The method of medication adherence measurement was clearly described in the majority of studies, but, for some studies, the method of handling the switching of drugs within and between therapeutic classes was not appropriately explained [26, 27, 34, 38, 42-46, 48, 49, 52, 54, 55, 59, 60].…”