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Nelson DE, Powell K, Johnson CJ, Mercy J, Grant-Worley JA.Nelson DE, et al.Am J Prev Med. 1999 May;16(4):298-302. doi: 10.1016/s0749-3797(98)00096-8.Am J Prev Med. 1999.PMID: 10493285
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Nelson DE, Fleming DW, Grant-Worley J, Houchen T.Nelson DE, et al.J Public Health Manag Pract. 1995 Spring;1(2):8-17.J Public Health Manag Pract. 1995.PMID: 10186613