1. Diagnostic and Interventional Ultrasound Unit Valle del Serchio General Hospital Lucca Italy
2. Emergency Medicine Unit San Giovanni di Dio Hospital Florence Italy
3. Pulmonary Medicine Unit, Department of Cardiovascular and Thoracic Sciences, Fondazione Policlinico Universitario Agostino Gemelli Istituto di Ricovero e Cura a Carattere Scientifico Rome Italy
4. Department of Information Engineering and Computer Science, Ultrasound Laboratory Trento University of Trento Trento Italy