Serdal Kenan Köse, Derya Öztuna, Şehim Kutlay, Atilla Halil Elhan, Alan Tennant, and Ayşe Adile Küçükdeveci, “Psychometric Properties of the Health Assessment Questionnaire Disability Index (HAQ-DI) and the Modified Health Assessment Questionnaire (MHAQ) in Patients with Knee Osteoarthritis”, Archives of Rheumatology, vol. 25, no. 3, pp. 147–155, Sep. 2010.