William C. Cockerham, Gerhard Kunz, Guenther Lueschen, Social Stratification and Health Lifestyles in Two Systems of Health Care Delivery: A Comparison of the United States and West Germany, Journal of Health and Social Behavior, Vol. 29, No. 2 (Jun., 1988), pp. 113-126
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Cockerham et al. (1988) studied this question.