1 Department of Vascular Surgery, Red Cross Hospital, Athens, Greece. Electronic address: paraskevask@hotmail.com.
2 Department of Cardiac and Vascular Diseases, Medical College, Jagellonian University, Krakow, Poland; John Paul II Hospital, Krakow, Poland.
3 Liverpool Center for Cardiovascular Science at University of Liverpool, Liverpool John Moore University and Liverpool Heart & Chest Hospital, UK; Danish Center for Health Services Research, Department of Clinical Medicine, Aalborg University, Denmark.
4 Department of Neurology and Stroke Program, University of Maryland School of Medicine, Baltimore, Md, USA.