00460nas a2200193   4500000000100000008004100001260003900042100001600081700001600097700001600113700001600129700001300145700001300158700001400171700001400185700001600199700001300215245003800228       2001                            d  bCambridge University PressaLondon1 aCummings P.1 aCummings P.1 aKoepsell T.1 aKoepsell T.1 aMaier R.1 aMaier R.1 aRivara F.1 aRivara F.1 aGrossman D.1 aNorton R00aChapter 5. Rates and denominators