Fig 1. Cohort recruitment via BRIMM infrastructure.

Abbreviations: GP: general practitioner, Nivel-PCD: Nivel Primary Care Database, ICPC: international classification of primary care, TTP: trusted third party, PROs: patient reported outcomes, EHR: electronic health records. Adapted from Hek et al. (2022) [7]. * The Municipal Health services (GGD) provided the national testing facilities and positive tests were sent to GPs via automated coupling under the prerequisite that patients gave consent.