1. University of Chicago, Medicine, 5841 S. Maryland Ave., MC 1027, Chicago, Chicago, Illinois, United States, 60637-5418, ;
2. Rush University Medical Center, Department of Family & Preventative Medicine, Chicago, Illinois, United States, ;
3. Massachusetts General Hospital, Endocrine Division, Boston, Massachusetts, United States,
4. Harvard Medical School, Boston, Massachusetts, United States, ;