1. Oslo and Akershus University College of Applied Sciences; Oslo Norway
2. University of Delaware, Newark, and Boston University School of Medicine; Boston Massachusetts
3. Boston University School of Medicine; Boston Massachusetts
4. University of Iowa; Iowa City
5. University of Alabama; Birmingham
6. University of California; San Francisco
7. Boston University School of Medicine and School of Public Health; Boston Massachusetts
8. Boston University School of Medicine, Boston, Massachusetts, and University of Manchester; Manchester UK