1. Department of Medicine, Oregon Health & Science University, Portland, Oregon.
2. Department of Epidemiology, University of Pittsburgh, Pittsburgh, Pennsylvania.
3. Department of Surgery, Legacy Good Samaritan Hospital, Portland, Oregon.
4. Columbia University Medical Center, New York, New York.
5. University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania.
6. Mount Sinai Medical Center, New York, New York.
7. East Carolina MC, Greenville, North Carolina.
8. Cornell University, New York, New York.
9. Neuropsychiatric Research Institute, Fargo, North Dakota.
10. Department of Surgery, Oregon Health & Science University, Portland, Oregon.