1. Department of Preventive Medicine, Northwestern University, Chicago, IL, USA
2. Department of Health Research and Policy, Stanford University, Stanford, CA, USA
3. Department of Biostatistics, Harvard University, Boston, MA, USA
4. Department of Biostatistics and Computational Biology, Dana Farber Cancer Institute, Boston, MA, USA
5. Cardiovascular Division, Brigham and Women’s Hospital, Boston, MA, USA
6. Merck Research Laboratories, Rahway, NJ, USA