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Kilcher G, Hummel N, Didden EM, Egger M, Reichenbach S; GetReal Work Package 4.Kilcher G, et al. Among authors: hummel n.Rheumatology (Oxford). 2018 Feb 1;57(2):354-369. doi: 10.1093/rheumatology/kex394.Rheumatology (Oxford). 2018.PMID: 29149289Review.