Fig. 1From: Psychometric properties of medication adherence instruments in cardiovascular diseases and type 2 diabetes mellitus: systematic review protocolFlowchart of the steps necessary to perform a systematic review of PROMs. Source: Extracted from Prinsen et al., 2018, p. 1149. Note: PROM = Patient-reported outcome measures; COSMIN = Consensus-based Standards for the selection of Health Measurement Instruments; GRADE = Grading of Recommendations Assessment, Development, and EvaluationBack to article page