1. Department 3344, Rigshospitalet, Copenhagen University Hospital,; Copenhagen Trial Unit, Centre for Clinical Intervention Research,; Blegdamsvej 9 Copenhagen Denmark DK-2100
2. Copenhagen Trial Unit, Centre for Clinical Intervention Research,; Cochrane Hepato-Biliary Group; Department 3344, Rigshospitalet, Copenhagen University Hospital, Blegdamsvej 9 Copenhagen Denmark DK-2100
3. Ospedale V.Cervello; Divisione di Medicina; Via Trabucco 180 Palermo Italy I-90146