Allocation
RECRUITMENT
Block randomisation will be performed for each general practice, with the same number of patients per block. Allocation to the intervention or control group is randomised within each block (10 blocks of 10 per practice) to keep the number of case IDs balanced, even if the lists are not finished. The case IDs were generated with R version 4.2.2 and are reproducible. Only the German Pension Insurance is able to link the pseudonyms to the actual persons.The assignment of the participants included in the study to the intervention or control group is performed randomly, as the practice staff cannot influence the group affiliation of the invited participants during the recruitment process. The practice staff hand out the questionnaires and study documents in sealed, non-transparent envelopes on which the group affiliation is not indicated. The envelopes are only labelled with the questionnaire number (case ID) and are first opened by the participants.