Data collection
SECONDARY
Data were collected in a cross-sectional postal survey from September to December 2020. The survey was designed for the purpose of this study (see Additional file For descriptive analysis, we utilized three items from the main study as secondary data aggregated at the practice level (1: Share of participating patients with medication changes per practice, 2: Median number of medication warnings per patient prior to intervention, 3: Median number of medication warnings after intervention; see also Table 