1 Pauley Heart Center, Virginia Commonwealth University Medical Center, Richmond, VA, United States.
2 McGuire Veterans Affairs Medical Center, 1201 Broad Rock Boulevard, 111J, Richmond, VA 23249, United States.
3 Pauley Heart Center, Virginia Commonwealth University Medical Center, Richmond, VA, United States; McGuire Veterans Affairs Medical Center, 1201 Broad Rock Boulevard, 111J, Richmond, VA 23249, United States. Electronic address: isjovin@yahoo.com.