1. Department of Medicine, Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA.
2. Division of Infectious Diseases, The Miriam Hospital, Providence, Rhode Island, USA.
3. Fay W. Boozman College of Public Health, Little Rock, Arkansas, USA.
4. Department of Health Services Policy and Practice, Brown School of Public Health, Providence, Rhode Island, USA.
5. College of Osteopathic Medicine, University of New England, Biddeford, Maine, USA.