1. Fondazione Policlinico Universitario Agostino Gemelli IRCCS UniversitàCattolica del Sacro Cuore, Rome, Italy (G.I., R.M., G.D.S., M.I., L.M., M.S., R.C., A.G., M.F., G.C.)
2. University of Leeds and St. James's University Hospital, Leeds, United Kingdom (A.C.F.)
3. University of Lincoln, Lincoln, United Kingdom (G.R.L.)
4. Medical University of Innsbruck, Innsbruck, Austria (H.T.)