00409pam a2200145 a 4500020001600000082001600016100002400032245008000056250001200136260003100148300001200179654002500191654002300216700002400239  a0023412704 00a001.42bGEH1 aGehlbach, Stephen H10aInterpreting the medical literature : Practical epidemiology for clinicians  a2nd ed.  aNew York bMacmillanc1988  a218 p.   aResearch Methodology  aCommunity Medicine  aGehlbach, Stephen H