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*1001 $aLichtenberg, Frank R$0(NO-TrBIB)90611297$_30447400
*24514$aThe effect of drug vintage on survival :$bmicro evidence from Puerto Rico's medicaid program$cFrank R. Lichtenberg
*260  $aCambridge, Mass.$bNational Bureau of Economic Research$c2004
*300  $a14, [9] s.$btab.
*4901 $aWorking paper series / National Bureau of Economic Research$v10884
*830 0$aWorking paper series (National Bureau of Economic Research : trykt utg.)$x0898-2937$v10884$w999105437124702201$_13074900
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