[1] Univ Autonoma Madrid UAM, Hosp Univ La Princesa, Inst Invest Sanitaria Princesa IIS IP, Dept Gen & Digest Surg,HPB Unit, Madrid, Spain
[2] Liverpool Univ Hosp NHS Fdn Trust, Aintree Univ Hosp, Liverpool, Merseyside, England
[3] Salzkammergutklinikum Vocklabruck, Vocklabruck, Austria