1. Faculty of Medicine, Pontificia Universidad Católica de Chile; Department of Internal Medicine, Evidence Based Health Care Program; Lira 44, Santiago Santiago Región metropolitana Chile
2. Pontificia Universidad Católica de Chile; Evidence-Based Health Care Program; Lira 44, Santiago Santiago Región metropolitana Chile
3. State University of New York at Buffalo; Department of Medicine; 8125 Clarence Center Rd East Amherst NY USA 14051