1. Copenhagen Trial Unit, Centre for Clinical Intervention Research, Department 7812, Rigshospitalet, Copenhagen University Hospital; Copenhagen Denmark
2. Copenhagen Trial Unit, Centre for Clinical Intervention Research, Department 7812, Rigshospitalet, Copenhagen University Hospital; Cochrane Hepato-Biliary Group; Blegdamsvej 9 Copenhagen Sjaelland Denmark DK-2100
3. Bispebjerg Hospital; Department of Occupational and Environmental Medicine; Copenhagen Denmark
4. Furesøhave 4B Birkerød Denmark DK-3460