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Cowan DN, Brundage JF, Pomerantz RS, Gardner LI, Miller RN, Wann ZF.Cowan DN, et al.N Y State J Med. 1991 Nov;91(11):479-82.N Y State J Med. 1991.PMID: 1771042
Prier RE, Cowan DN.Prier RE, et al. Among authors: cowan dn.J Epidemiol Community Health. 1987 Sep;41(3):229-32. doi: 10.1136/jech.41.3.229.J Epidemiol Community Health. 1987.PMID: 3502133Free PMC article.