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Buttgereit, Thomas; Palmowski, Andriko; Forsat, Noah; Boers, Maarten; Witham, Miles D; Rodondi, Nicolas; Moutzouri, Elisavet; Navidad, Antonio Jesus Quesada; Van't Hof, Arnoud W J; van der Worp, Bart; Coll-Planas, Laura; Voshaar, Marieke; de Wit, Maarten; da Silva, José; Stegemann, Sven; Bijlsma, Johannes W; Koeller, Marcus; Mooijaart, Simon; Kearney, Patricia M and Buttgereit, Frank (2021). Barriers and potential solutions in the recruitment and retention of older patients in clinical trials-lessons learned from six large multicentre randomized controlled trials. Age and ageing, 50(6), pp. 1988-1996. Oxford University Press 10.1093/ageing/afab147
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
