1. ManilaMed (Medical Center Manila); Section of Gastroenterogy, Department of Internal Medicine Manila; General Luna 1122 Ermita Manila Philippines 1000
2. Copenhagen Trial Unit, Centre for Clinical Intervention Research, Department 7812, Rigshospitalet, Copenhagen University Hospital; The Cochrane Hepato-Biliary Group; Blegdamsvej 9 Copenhagen Denmark DK-2100