Dr. Häussler and Dr. Rehberg are affiliated with the Institute for Health and Social Research, Wichmannstrasse 24, D-10787 Berlin, Germany (e-mail, iges@iges.de). Dr. Sturm and Ms. Bao are affiliated with Rand in Santa Monica, California. Harold A. Pincus, M.D., and Terri L. Tanielian, M.A., are editors of this column.