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Health assessment questionnaire reproduced from Ramey DR, Fries JF, Singh G. in B. Spilker Quality of Life and Pharmacoleconomics in Clinical Trials, 2nd ed., The Health Assessment Questionnaire 1995—Status and Review. Philadelphia: Lippincott-Raven Pub., 1996, pp. 227–237 [21]. Patients answer to the question and each answer correspond to a number from 0 (normal activity) to 3 (totally uncapable to do something).
