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Avedis Donabedian, Models for Organizing the Delivery of Personal Health Services and Criteria for Evaluating Them, The Milbank Memorial Fund Quarterly, Vol. 50, No. 4, Part 2: Medical Cure and Medical Care: Prospects for the Organization and Financing of Personal Health Care Services. Proceedings of the Sun Valley Forum on National Health, Inc. Sun Valley, Idaho June 25-July 1, 1972 (Oct., 1972), pp. 103-154
Avedis Donabedian (Sun,) studied this question.