An Ounce of Prevention. . . . What Are the Returns? Centers for Disease Control and Prevention Epidemiology Program Office Office of Program Planning and EvaluationJeffrey P Koplan, H Director, Stephen B Thacker, Director, Vilma G Carande-Kulis, S Phaedra +22 others1999All material in this publication is in the public domain and may be used and reprinted without permission; citation as to source, however, is appreciated.