S. Lori Brown, PhD, MPH. Epidemiologist. Epidemiology Branch. Division of Postmarket Surveillance. Center for Devices and Radiological Health. U.S. Food and Drug Administration. Rockville, MD, USA.

Roselie A. Bright, ScD. Epidemiologist. Epidemiology Branch. Division of Postmarket Surveillance. Center for Devices and Radiological Health. U.S. Food and Drug Administration. Rockville, MD, USA

Dale R. Tavris, MD, MPH. Epidemiologist. Epidemiology Branch. Division of Postmarket Surveillance. Center for Devices and Radiological Health. U.S. Food and Drug Administration. Rockville, MD, USA