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Wong MD, Cunningham WE, Shapiro MF, Andersen RM, Cleary PD, Duan N, Liu HH, Wilson IB, Landon BE, Wenger NS; HCSUS Consortium.Wong MD, et al. Among authors: wenger ns.J Gen Intern Med. 2004 Apr;19(4):366-74. doi: 10.1111/j.1525-1497.2004.30429.x.J Gen Intern Med. 2004.PMID: 15061746Free PMC article.