1. Department of Medicine and Pediatrics, School of Medicine, University of Colorado Denver, Aurora, Colorado.
2. Barbara Davis Center for Diabetes, Aurora, Colorado.
3. Keck School of Medicine of the University of Southern California, Los Angeles, California.
4. University of North Carolina School of Medicine, Chapel Hill, North Carolina.
5. Children's and Youth Hospital Auf der Bult, Hannover Medical School, Hannover, Germany.