[1] Lugano Reg Hosp, Dept Surg, Ente Osped Cantonale EOC, Lugano, Switzerland
[2] Univ Southern Switzerland USI, Fac Biomed Sci, Lugano, Switzerland
[3] Univ Lausanne, Fac Biomed Sci, Lausanne, Switzerland
[4] Univ Pisa, Azienda Osped Univ Pisana AOUP, Hepatobiliary Surg & Liver Transplant Div, Pisa, Italy
[5] Via Tesserete 46, CH-6900 Lugano, Switzerland