1. Department of Internal Medicine; University of Michigan; Ann Arbor Michigan USA
2. Department of Internal Medicine; University of Nebraska; Omaha Nebraska USA
3. Department of Internal Medicine; Northwestern University; Chicago Illinois USA
4. Department of Internal Medicine; Washington University; St. Louis Missouri USA
5. Department of Internal Medicine; The Ohio State University; Columbus Ohio USA
6. Department of Internal Medicine; Loyola University Medical Center; Maywood Illinois USA
7. Department of Internal Medicine; Mayo Clinic; Rochester Minnesota USA
8. Department of Internal Medicine; Henry Ford Health System; Detroit Michigan USA
9. Department of Internal Medicine; University of Iowa; Iowa City Iowa USA
10. Department of Internal Medicine; University of Wisconsin; Madison Wisconsin USA
11. Department of Internal Medicine; University of Minnesota; Minneapolis Minnesota USA
12. Department of Internal Medicine; University of Kansas Medical Center; Kansas City Kansas USA
13. Department of Internal Medicine; University of Chicago; Chicago Illinois USA