00327nam a22001337a 4500020001800000082001300018100002300031245003500054250000800089260003900097300001100136654002300147700002300170  a9780323034067  a613bNOR  aNordness, Robert J  aEpidemiology and biostatistics  aNil  aPhiladelphiabMosby/Elsevierc2006  a262 p.  aCommunity Medicine  aNordness, Robert J