1. Drug Safety Research and Development, Pfizer Inc., Groton, CT, USA;
2. Drug Safety Research and Development, Pfizer Inc., La Jolla, CA, USA;
3. National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, MD, USA;
4. Department of Internal Medicine, University of North Carolina, Chapel Hill, NC, USA;
5. Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA;
6. Department of Internal Medicine, IUPUI, Indianapolis, IN, USA;
7. Department of Internal Medicine, Wake Forest University School of Medicine, Winston-Salem, NC, USA