RT Journal Article SR Electronic T1 Guide to Clinical Trials ed. by Bert Spilker, PhD, MD JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 553 OP 554 VO 59 IS 5 A1 Litt, Rosalie Morss YR 1992 UL http://www.ccjm.org/content/59/5/553.4.abstract AB