1. Department of Cardiovascular Medicine Mayo Clinic Rochester MN
2. Division of Pulmonary and Critical Care Medicine Department of Medicine Mayo Clinic Rochester MN
3. Division of Cardiovascular Diseases Robert Packer Hospital/Guthrie Clinic Towanda PA
4. Division of Cardiovascular Diseases Jersey City Medical Center Jersey City NJ
5. Division of Cardiovascular Diseases University of Iowa Carver College of Medicine Iowa City IA
6. Department of Cardiovascular Surgery Mayo Clinic Rochester MN