Raven, Ann Clinical trials : an introduction / by Ann Raven ; with a foreword by Frank Wells - 2nd ed. - Oxford : Radcliffe Medical Press, 1993 - 110 p. ; 22 cm. ISBN: 1857750357 RM45.94 Subjects--Topical Terms: Clinical trials National Library of Medicine Call No.: W20.5.R253c 1993 9