Sources for attributes and levels of Discrete Choice Experiment (DCE).
NHS indicates National Health Service.We first selected the most frequent attributes found in DCE studies of pharmacy-based interventions: model of pharmacy intervention, waiting time, chance of best treatment, and cost [Levels were informed by the different sources as outlined further. Level 1 was defined as usual care in all attributes (almost no collaborative or integrated care). The remaining levels sought to illustrate possible responses within a collaborative care model. Level 2 represents improved care (vs. usual care) and level 3 represents the care level provided in the intervention arm of the collaborative care trial (the highest form of collaborative care) for all attributes except cost. Levels of the cost attribute are explained further.The final set of attributes and levels after the pre-test is shown in 