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*24504$aThe magnitude and nature of risk selection in employer-sponsored health plans$cSean Nicholson ... [et al.]
*260  $aCambridge, Mass.$bNational Bureau of Economic Research$c2003
*300  $a29 s.$bill.
*4901 $aWorking paper series / National Bureau of Economic Research$v9937
*7001 $aNicholson, Sean$0(NO-TrBIB)1066425$_27662400
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