Jeremy A. Greene is professor of medicine and the history of medicine and the Elizabeth Treide and A. McGehee Harvey Chair in the History of Medicine at Johns Hopkins University School of Medicine. He is the author ofPrescribing by Numbers: Drugs and the Definition of Disease and Generic: The Unbranding of Modern Medicine.Flurin Condrau is professor and director of the Institute and Museum of the History of Medicine at the University of Zurich and coeditor ofTuberculosis Then and Now: Current Issues in the History of an Infectious Disease.Elizabeth Siegel Watkins is dean of the Graduate Division, vice chancellor of Student Academic Affairs, and professor of the history of health science at the University of California, San Francisco. She is the author ofOn the Pill: A Social History of Oral Contraceptives, 1950-1970 and The Estrogen Elixir: A History of Hormone Replacement Therapy in America, coeditor ofMedicating Modern America: Prescription Drugs in History, and, with Jeremy Greene, editor ofPrescribed: Writing, Filling, Using, and Abusing the Prescription in Modern America.