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Results: 2

1.
W. J. Gilchrist, R. J. Newman, D. L. Hamblen, B. O. Williams
BMJ. 1988 October 29; 297(6656): 1116–1118.
PMCID:
PMC1834849
2.
W B Applegate, M J Graney, S T Miller, J T Elam
Am J Public Health. 1991 October; 81(10): 1302–1306.
PMCID:
PMC1405339

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