1. Department of Thoracic Surgery, San Giovanni Hospital, Ente ospedaliero cantonale Bellinzona, Bellinzona, Switzerland
2. Division of General Surgery, Ospedale Regionale di Locarno, Locarno, Switzerland
3. Department of Cardiac Surgery, Cardiocentro Ticino, Lugano, Switzerland
4. Clinical Cytopathology Service, Histopathology Service, Locarno, Switzerland