Pain sub-types and clinical characteristics associated with placebo response in OA: Data from two phase 3 randomized clinical trials in symptomatic knee osteoarthritis. (April 2016) - Bihlet, A.R.; Byrjalsen, I.; Bay-Jensen, A.-C.; Gühring, H.; Michaelis, M.; Ladel, C.; Valter, I.; Riis, B.J.; Christiansen, C.; Andersen, J.R.; Karsdal, M.A.