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Spencer BA, Babey SH, Etzioni DA, Ponce NA, Brown ER, Yu H, Chawla N, Litwin MS.Spencer BA, et al. Among authors: ponce na.Cancer. 2006 Feb 15;106(4):765-74. doi: 10.1002/cncr.21673.Cancer. 2006.PMID: 16419068Free article.
Wang Y, Ponce NA, Wang P, Opsomer JD, Yu H.Wang Y, et al.Am J Public Health. 2015 Dec;105(12):2534-40. doi: 10.2105/AJPH.2015.302810.Am J Public Health. 2015.PMID: 26544642Free PMC article.
Saadi A, Ponce NA.Saadi A, et al.J Gen Intern Med. 2020 May;35(5):1419-1426. doi: 10.1007/s11606-019-05412-w. Epub 2019 Nov 1.J Gen Intern Med. 2020.PMID: 31677103Free PMC article.