1 Department of Cardiovascular Diseases, Mayo Clinic, Scottsdale, AZ, United States.
2 Department of Cardiovascular Diseases, Mayo Clinic, Scottsdale, AZ, United States; Department of Internal Medicine, Creighton University, Phoenix, AZ, United States.
3 Department of Cardiovascular Diseases, Mayo Clinic, Rochester, MN, United States.
4 Department of Cardiovascular Diseases, Mayo Clinic, Scottsdale, AZ, United States. Electronic address: [email protected].