1. School of Nursing; University of Pittsburgh; Pittsburgh Pennsylvania
2. Division of Pulmonary, Allergy, and Critical Care Medicine; University of Pittsburgh School of Medicine; Pittsburgh Pennsylvania
3. VA Pittsburgh Healthcare System; Pittsburgh Pennsylvania
4. Department of Molecular and Clinical Medicine/Cardiology, Sahlgrenska Academy; University of Gothenburg; Sweden
5. Department of Cardiology; Sahlgrenska University Hospital/Ostra; Gothenburg Sweden
6. Department of Pulmonary Medicine, Faculty of Medicine; Marmara University; Istanbul Turkey