1. Department of Family Medicine, The Warren Alpert Medical School, Pawtucket, RI, USA
2. University of Michigan Medical School, Ann Arbor, MI, USA
3. University of Texas Dell Medical School, Austin, TX, USA
4. University of Chicago, Chicago, IL, USA
5. Brody School of Medicine at East Carolina University, Greenville, NC, USA
6. Mayo Clinic Alix School of Medicine, Rochester, MN, USA
7. Penn State College of Medicine, Hershey, PA, USA