[1] St Bartholomews Hosp, Barts Thorax Ctr, London, England
[2] Maastricht Univ, Med Ctr, Heart & Vasc Ctr, Dept Cardiothorac Surg, Maastricht, Netherlands
[3] Univ Pisa, Dept Surg Med & Mol Pathol & Crit Care Med, Minimally Invas & Robot Thorac Surg, Pisa, Italy
[4] Scuola Super Sant Anna, Inst Management, Management & Healthcare Lab, Pisa, Italy
[5] Scuola Super Sant Anna, Dept EMbeDS, Pisa, Italy
[6] St Bartholomey Hosp, London EC1A 7BE, England