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Editor's Note: Robert Klitzman is a professor of psychiatry at the Columbia University Vagelos College of Physicians and Surgeons and at the Columbia University Mailman School of Public Health.

Editor's Note: Rita Charon is chair of the Department of Medical Humanities and Ethics at the Columbia University Vagelos College of Physicians and Surgeons.

Determining an accurate latency period is difficult, according to Lyall A. Gorenstein, a thoracic surgeon and lung cancer expert at Columbia University Irving Medical Center.