1 Division of Cardiology, Department of Internal Medicine, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA.
2 Department of Cardiology, Mater Misericordiae University Hospital, Dublin, Ireland.
3 Faculty of Medicine and Surgery, University of Palermo, Palermo, Sicilia, Italy.
4 Division of Cardiology, Department of Internal Medicine, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA arheartdoc@gmail.com.