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Engel A, Johnson ML, Haynes SG. Health effects of sunlight exposure in the United States. Results from the first National Health and Nutrition Examination Survey, 1971-1974. Arch Dermatol. 1988;124(1):72-9
Engel, A., Johnson, M. L., & Haynes, S. G. (1988). Health effects of sunlight exposure in the United States. Results from the first National Health and Nutrition Examination Survey, 1971-1974. Archives of dermatology, 124(1), 72-9.
Engel, A, et al. "Health effects of sunlight exposure in the United States. Results from the first National Health and Nutrition Examination Survey, 1971-1974." Archives of dermatology vol. 124,1 (1988): 72-9.
Engel A, Johnson ML, Haynes SG. Health effects of sunlight exposure in the United States. Results from the first National Health and Nutrition Examination Survey, 1971-1974. Arch Dermatol. 1988 Jan;124(1):72-9. PMID: 3257372.
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