1. Division of Cardiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
2. School of Medicine, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil
3. Division of Vascular Medicine, São Luiz Rede D'Or, São Paulo, SP, Brazil
4. Associate Professor of Medicine, Division of Pulmonary and Critical Care Medicine, Mayo Clinic, Rochester, MN, USA