Power, recruitment, and inclusion
For the PrevOP-PAP, with an alpha level of 0.05 and a stability factor of 0.68 of the measure to assess the primary outcome (OAK symptoms as measured by the WOMAC [With an expected drop-out rate of 20%, the required sample size increased to Inclusion and exclusion criteria were mostly relevant for the medical PrevOP-MMT and are listed in the additional file (Additional Information 