00373nam a22001457a 4500020001800000082001300018100002300031245003500054250001200089260002800101300001300129524003900142654002300181700002300204  a9780199468218  a613bROT  aRothman, Kenneth J  aEpidemiology : An introduction  a2nd ed.  aNew DelhibOxfordc2016  a1-268 p.  aDr.Saju C.R,HOD,Community Medicine  aCommunity Medicine  aRothman, Kenneth J