1. Department of Medicine; Boston University School of Medicine; Boston Massachusetts USA
2. Department of Radiology; Massachusetts General Hospital and Harvard Medical School; Boston Massachusetts USA
3. Sanford/Burnham Medical Research Institute at Lake Nona, Orlando, Florida; USA
4. Translational Research Institute for Metabolism and Diabetes; Florida Hospital; Orlando Florida USA
5. Neuroendocrine Unit; Department of Medicine; Massachusetts General Hospital and Harvard Medical School; Boston Massachusetts USA