Validation-Study of Womac - a Health-Status Instrument for Measuring Clinically Important Patient Relevant Outcomes to Antirheumatic Drug-Therapy in Patients with Osteo-Arthritis of the Hip or Knee. - Bellamy,N.; Buchanan,WW.; Goldsmith,CH.; Campbell,J.; Stitt,LW. (Journal of Rheumatology, 1988)