1. Beijing University of Chinese Medicine; Centre for Evidence-Based Chinese Medicine ; 11 Bei San Huan Dong Lu, Chaoyang District Beijing China 100029
2. Copenhagen Trial Unit, Centre for Clinical Intervention Research, Department 3344, Rigshospitalet, Copenhagen University Hospital; Cochrane Hepato-Biliary Group; Blegdamsvej 9 Copenhagen Denmark DK-2100
3. Copenhagen Trial Unit, Centre for Clinical Intervention Research; Cochrane Hepato-Biliary Group; Rigshospitalet, Dept. 3344 Blegdamsvej 9 Copenhagen Denmark DK-2100