1. HPB Surgery Unit, Hammersmith Hospital, NHS/Imperial College, London, UK
2. Service de Chirurgie Digestive, Hôpital Antoine Béclère, Clamart, Assistance Publique-Hôpitaux de Paris, Université Paris XI, Paris, France
3. Dipartimento di Scienze Chirurgiche, Università di Parma, Parma, Italy