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Hays RD, Smith AW, Reeve BB, Spritzer KL, Marcus SE, Clauser SB.Hays RD, et al.Health Care Financ Rev. 2008 Summer;29(4):57-67.Health Care Financ Rev. 2008.PMID: 18773614Free PMC article.
Cunningham WE, Wong M, Hays RD.Cunningham WE, et al.J Natl Med Assoc. 2008 Jul;100(7):840-7. doi: 10.1016/s0027-9684(15)31379-1.J Natl Med Assoc. 2008.PMID: 18672562Free PMC article.