1. Department of MedicineUniversity of PittsburghMedical CenterPittsburghPAUSA
2. Division of PulmonaryAllergy, and Critical Care MedicineDepartment of MedicineUniversity of PittsburghMedical CenterPittsburghPAUSA
3. Heritage College of Osteopathic MedicineOhio UniversityAthensOHUSA
4. Pittsburgh Heart, Lung, Blood, and Vascular Medicine InstituteUniversity of PittsburghMedical CenterPittsburghPAUSA
5. Division of CardiologyDepartment of MedicineUniversity of PittsburghMedical CenterPittsburghPAUSA