1. Cardiovascular Ultrasound Imaging and Hemodynamic Laboratory, Department of Cardiovascular Medicine, Mayo Clinic, Rochester, Minnesota.
2. Division of Cardiovascular Diseases, Assiut University, Assuit, Egypt.
3. Arcispedale Santa Maria Nuova (IRCCS), Reggio Emilia, Italy.
4. Department of Cardiovascular Medicine, Mayo Clinic, Scottsdale, Arizona.
5. Memorial Hospital, Jacksonville, Florida.
6. Women's Heart Clinic, Department of Cardiovascular Medicine, Mayo Clinic, Rochester, Minnesota.
7. Cardiovascular Catheterization Laboratory, Department of Cardiovascular Medicine, Mayo Clinic, Rochester, Minnesota.
8. Department of Medicine, Division of Cardiology, Dalhousie University, Halifax, Nova Scotia, Canada.