1. Copenhagen Trial Unit, Centre for Clinical Intervention Research, Department 3344, Rigshospitalet, Copenhagen University Hospital; Cochrane Hepato-Biliary Group; Blegdamsvej 9 Copenhagen Denmark DK-2100
2. Rymarksvej 79, 1. tv Hellerup Denmark 2900
3. 99 Craddock Road Sale, Cheshire UK M33 3LJ
4. Manchester Royal Infirmary; Oxford Road Manchester UK M13 9WL