1. Ultrasound Reading Center, Department of Radiology, Tufts Medical Center, Boston, MA
2. Department of Epidemiology, Johns Hopkins University, Baltimore, MD
3. Collaborative Health Studies Coordinating Center, University of Washington, Seattle, WA
4. Division of Public Health Sciences, Wake Forest School of Medicine, Winston‐Salem, NC
5. Departments of Medicine and Epidemiology, Columbia University, New York, NY
6. Department of Medical Imaging, University of Toronto, Ontario, Canada
7. Saint Elizabeth's Medical Center, Boston, MA