A RANDOMIZED, CROSS-OVER STUDY TO INVESTIGATE THE EFFECT OF WEIGHT-BEARING VS NON-WEIGHT-BEARING EXERCISE AND CARDIOVASCULAR STRESS ON TYPE II COLLAGEN TURNOVER IN PATIENTS WITH KNEE OSTEOARTHRITIS - SERUM BIOMARKER DATA FROM THE EFEX-OA-02 STUDY. (April 2022) - Bjerre-Bastos, J.J.