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Kim I, Williamson DF, Byers T, Koplan JP.Kim I, et al. Among authors: koplan jp.Am J Public Health. 1993 Apr;83(4):546-50. doi: 10.2105/ajph.83.4.546.Am J Public Health. 1993.PMID: 8460732Free PMC article.
Vartiainen E, Du DJ, Marks JS, Korhonen H, Geng GY, Guo ZY, Koplan JP, Pietinen P, We GL, Williamson D, et al.Vartiainen E, et al. Among authors: koplan jp.Public Health Rep. 1991 Jan-Feb;106(1):41-6.Public Health Rep. 1991.PMID: 1899938Free PMC article.
Hatziandreu EI, Koplan JP, Weinstein MC, Caspersen CJ, Warner KE.Hatziandreu EI, et al. Among authors: koplan jp.Am J Public Health. 1988 Nov;78(11):1417-21. doi: 10.2105/ajph.78.11.1417.Am J Public Health. 1988.PMID: 3140681Free PMC article.