1. OMERACT conference on outcome measures in rheumatoid arthritis clinical trials – conclusion;Tugwell;J Rheumatol,1993
2. Magnetic resonance imaging in rheumatoid arthritis: summary of OMERACT activities, current status, and plans;Conaghan;J Rheumatol,2001
3. The OMERACT filter for outcome measures in rheumatology;Boers;J Rheumatol,1998
4. Introduction to Measurement Theory;Allen,1979
5. Statistical Bases of Reference Values in Laboratory Medicine;Harris,1995