1 Interventional and Diagnostic Ultrasound Unit, Department of Internal Medicine, IRCCS Casa Sollievo della Sofferenza Hospital, San Giovanni Rotondo, Italy.
2 The School of Medicine, The University of Catania, Via Santa Sofia 78, Policlinico, Catania, Italy.
3 EMA, The European Medical Association, Avenue des Volontaires, 19 1160 Brussels, Belgium.