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David Mechanic, Correlates of Physician Utilization: Why Do Major Multivariate Studies of Physician Utilization Find Trivial Psychosocial and Organizational Effects?, Journal of Health and Social Behavior, Vol. 20, No. 4, Health Professions: Socialization, Organization, Utilization (Dec., 1979), pp. 387-396
David Mechanic (Sat,) studied this question.