RT Journal Article SR Electronic T1 Should thiopurine methyltransferase (TPMT) activity be determined before prescribing azathioprine, mercaptopurine, or thioguanine? JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 409 OP 413 DO 10.3949/ccjm.82a.14106 VO 82 IS 7 A1 Jennifer DiPiero A1 Kathryn Teng A1 J. Kevin Hicks YR 2015 UL http://www.ccjm.org/content/82/7/409.abstract AB