Margaret Battin, MD, Distinguished Professor of Philosophy and Adjunct Professor of Internal Medicine, and Timothy Quill, MD, Professor of Medicine, Psychiatry, and Medical Humanities at the University of Rochester, wrote in the introduction to their 2004 book Physician-Assisted Dying: The Case for Palliative Care & Patient Choice:

“Every study of physician practice in the United States… shows a measurable, fairly consistent incidence of physician-assisted suicide whether legal or not.”