00375nam a22001457a 4500020001500000082001600015100002200031245004600053250001200099260004300111300001100154654002500165654001700190700002200207  a0412276305  a001.42bALT  aAltman, Douglas G  aPractical statistics for medical research  a1st ed.  aBoca RatonbChapman & Hall / CRCc1999  a611 p.  aResearch Methodology  aBiochemistry  aAltman, Douglas G