1. Department of Medicine ; North Shore Medical Center; Salem Massachusetts
2. Department of Medicine ; University of Massachusetts Medical School; Worcester Massachusetts
3. School of Public Health ; University of Massachusetts Lowell; Lowell Massachusetts
4. Division of Hospital Medicine ; University of Kentucky College of Medicine; Lexington Kentucky
5. INRS-Institut Armand-Frappier ; Institut National de la Recherche Scientifique; Laval Québec Canada