Long-term efficacy and safety of intra-articular sprifermin in patients with knee osteoarthritis: results from the 5-year forward study. Issue 1 (April 2020) - Eckstein, F.; Hochberg, M.; Kraines, J.; Guehring, H.; Moreau, F.; Ona, V.; Bihlet, A.R.; Byrjalsen, I.; Andersen, J.R.; Daelken, B.; Guenther, O.; Ladel, C.; et al.