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Carrillo JE, Green AR, Betancourt JR.Carrillo JE, et al. Among authors: betancourt jr.Ann Intern Med. 1999 May 18;130(10):829-34. doi: 10.7326/0003-4819-130-10-199905180-00017.Ann Intern Med. 1999.PMID: 10366373
Betancourt JR, Green AR, Carrillo JE, Ananeh-Firempong O 2nd.Betancourt JR, et al.Public Health Rep. 2003 Jul-Aug;118(4):293-302. doi: 10.1093/phr/118.4.293.Public Health Rep. 2003.PMID: 12815076Free PMC article.