1. Division of Cardiovascular MedicineDepartment of MedicineBrigham and Women's Hospital and Harvard Medical SchoolBostonMassachusettsUSA
2. Division of Pulmonary and Critical Care MedicineDepartment of MedicineBrigham and Women's Hospital and Harvard Medical SchoolBostonMassachusettsUSA
3. Department of Pulmonary and Critical Care MedicineVeterans Affairs Boston Healthcare SystemBostonMassachusettsUSA
4. Division of Pulmonary and Critical Care MedicineDepartment of MedicineUniversity of WashingtonSeattleWashingtonUSA
5. Department of CardiologyVeterans Affairs Boston Healthcare SystemBostonMassachusettsUSA
6. Department of CardiologyBoston Children's HospitalBostonMassachusettsUSA