Boston Medical Center, Boston, Massachusetts, United States
University of Massachusetts, Worcester, Massachusetts, United States
Centre Hospitalier de l'Universite de Montreal, Montreal, Quebec, Canada
University Hospital Carl Gustav Carus, Dresden, Germany
Boston Medical Center, Boston, Massachusetts, United States
First St. Petersburg Pavlov State Medical University, Saint Petersburg, Russian Federation
Boston Medical Center, Boston, Massachusetts, United States
Boston Medical Center, Boston, Massachusetts, United States
Boston Medical Center, Boston, Massachusetts, United States
Boston Medical Center, Boston, Massachusetts, United States
Boston Medical Center, Boston, Massachusetts, United States