1. Columbia University, College of Physicians and Surgeons (W.R.), New York, New York 10019
2. St Luke's-Roosevelt Hospital Center (W.R.), New York, New York 10019
3. Division of Biostatistics and Epidemiology (S.E.H.), School of Public Health and Health Science, University of Massachusetts Amherst, Amherst, Massachusetts 01003
4. Division of Network Medicine (S.E.H.), Brigham and Women's Hospital, Boston, Massachusetts 02115
5. Pathology Department (P.M.S.), Massachusetts General Hospital/Harvard Medical School, Boston, Massachusetts 02114
6. Clinical Chemistry Branch (H.W.V.), Division of Laboratory Sciences, U.S. Centers for Disease Control and Prevention, Atlanta, Georgia 30341
7. University of Colorado School of Medicine (M.E.W.), Aurora, Colorado 80045
8. Denver Veterans Affairs Medical Center (M.E.W.), Denver, Colorado 80220