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Christensen, Robin; Maxwell, Lara J; Jüni, Peter; Tovey, David; Williamson, Paula R; Boers, Maarten; Goel, Niti; Buchbinder, Rachelle; March, Lyn; Terwee, Caroline B; Singh, Jasvinder A; Tugwell, Peter (2015). Consensus on the Need for a Hierarchical List of Patient-reported Pain Outcomes for Metaanalyses of Knee Osteoarthritis Trials: An OMERACT Objective. Journal of rheumatology, 42(10), pp. 1971-1975. Journal of Rheumatology Pub. Co. 10.3899/jrheum.141384
