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Koroukian SM, Xu F, Dor A, Cooper GS.Koroukian SM, et al. Among authors: cooper gs.Health Serv Res. 2006 Dec;41(6):2136-54. doi: 10.1111/j.1475-6773.2006.00585.x.Health Serv Res. 2006.PMID: 17116113Free PMC article.
Cooper GS, Yuan Z, Veri L, Rimm AA, Stange KC.Cooper GS, et al.Cancer. 1999 Nov 1;86(9):1669-74. doi: 10.1002/(sici)1097-0142(19991101)86:9<1669::aid-cncr7>3.0.co;2-b.Cancer. 1999.PMID: 10547538