“…Two studies (6%) applied a discrete choice conjoint analysis method to assess which aspects of outpatient care were most important to patients [40,48]. In most studies, the data were collected using a questionnaire ( n = 19, 54%) [5,24–26,28–30,33,34,40–45,48,49, 52,53]. The tools used for data collection were previously published, modified from previously used tools, or specifically developed for the study in question.…”