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Stucki, Gerold and Schönbächler, Josef and Brühlmann, Pius and Mariacher, Stefan and Stoll, Thomas and Michel, Beat A. (1994): Does a Muscle Strenght Index Provide complementary Information to traditional Disease Acivity Variables in Patients with rheumatoid Arthritis. In: Journal of Rheumatology, Vol. 21, No. 12: pp. 2200-2205

Brühlmann, Pius and Stucki, Gerold and Michel, Beat A. (1994): Evaluation of a German Version of the Physical Dimensions of the Health Assessment Questionnaire in Patients with Rheumatoid Arthritis. In: Journal of Rheumatology, Vol. 21: pp. 1245-1249