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Kaplan S, Cole P. Factors affecting response to postal questionnaires. Br J Prev Soc Med. 1970 Nov;24(4):245–247.[PMC free article][PubMed]
Kelsey JL. The incidence and distribution of slipped capital femoral epiphysis in Connecticut. J Chronic Dis. 1971 Jan;23(8):567–578.[PubMed]
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