Osteras, N., Moseng, T., Van Bodegom-Vos, L., Dziedzic, K., Ø. Andreassen,, Fenstad, A.M., Furnes, O., Nygren Hansen, J., Natvig, B., Røtterud, J.H., Schjervheim, U.B., Vliet Vlieland, T.P.M., Hagen, K.B., "OP0321-HPR HIGHER QUALITY OF CARE AND LESS SURGERY AFTER IMPLEMENTING OSTEOARTHRITIS GUIDELINES IN PRIMARY CARE– LONG-TERM RESULTS FROM A CLUSTER RANDOMIZED CONTROLLED TRIAL", , 2020