00462cam a2200181 a 4500020001800000082001300018100002000031245004200051250001200093260003100105300001300136650001700149650002600166650001700192654002300209700002000232700002800252  a978031654222700a613bMAC1 aMacMahon, Brian10aEpidemiology : Principles and methods  a2nd ed.  aPhiladelphiabLW & Wc1996  a1-347 p. 0aEpidemiology12aEpidemiologic Methods22aEpidemiology  aCommunity Medicine1 aMacMahon, Brian1 aTrichopoulos, Dimitrios