1. Endocrine Research Unit, San Francisco Veterans Affairs Medical Center, Department of Medicine, San Francisco, California
2. Department of Medicine, University of California San Francisco, San Francisco, California
3. The Maine Medical Center Research Institute, Scarborough, Maine
4. University of California San Francisco, San Francisco, California
5. Department of Medicine, University Health Network, Toronto, Ontario, Canada
6. University of Toronto, Toronto, Ontario, Canada
7. Mayo Clinic, Rochester, Minnesota
8. The University of Sheffield, Sheffield, United Kingdom