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Coenen, Michaela; Cieza, Alarcos; Stamm, Tanja A.; Amann, Edda; Kollerits, Barbara; Stucki, Gerold (2006): Validation of the International Classification of Functioning, Disability and Health (ICF) Core Set for rheumatoid arthritis from the patient perspective using focus groups. In: Arthritis Research & Therapy 8:R84 [PDF, 317kB]