Portney, Leslie Gross. Foundations of clinical research : applications to practice / Leslie Gross Portney, Mary P. Watkins. - 2nd ed. - Upper Saddle River, NJ : Prentice Hall, c2000. - xiv, 768 p. : ill. ; 25 cm. Includes index. Includes bibliographical references. ISBN: 0838526950 (hbk.) Subjects--Topical Terms: Medicine--Research--Methodology.