1. Facultad de Ciencias de la Salud Eugenio Espejo; Universidad UTE (Cochrane Ecuador); Quito Ecuador
2. Facultad de Medicina, Universidad Francisco de Vitoria (Cochrane Madrid); Madrid Spain
3. Cátedra Rectoral de Medicina Basada en la Evidencia; Universidad de Carabobo; Valencia Venezuela
4. Cochrane Hepato-Biliary Group, Copenhagen Trial Unit, Centre for Clinical Intervention Research; The Capital Region, Copenhagen University Hospital - Rigshospitalet; Copenhagen Denmark
5. Department of Regional Health Research; The Faculty of Health Sciences, University of Southern Denmark; Odense Denmark
6. Gastrounit, Medical Division; Copenhagen University Hospital Hvidovre; Hvidovre Denmark
7. Cochrane Hepato-Biliary Group; Copenhagen Trial Unit, Centre for Clinical Intervention Research, The Capital Region, Copenhagen University Hospital - Rigshospitalet; Copenhagen Denmark
8. Department of Therapy ; IM Sechenov First Moscow State Medical University; Moscow Russian Federation
9. Department of Gastroenterology; Botkin Hospital; Moscow Russian Federation
10. Liver Unit & Liver Transplant Unit; Hospital Italiano de Buenos Aires; Buenos Aires Argentina
11. Facultad de Medicina; Universidad Francisco de Vitoria (Cochrane Madrid); Madrid Spain
12. Centre for Evidence-Based Chinese Medicine; Beijing University of Chinese Medicine; Beijing China
13. Centro Asociado Cochrane Ecuador, Centro de Investigación en Salud Pública y Epidemiología Clínica (CISPEC); Universidad UTE; Quito Ecuador
14. Departamento de Obstetricia y Ginecología; Universidad de Carabobo; Valencia Venezuela
15. Division of General, Geriatric and Hospital Medicine; Stony Brook University, Renaissance School of Medicine HSC, Level 2, Rm 155; Stony Brook, 11794-8228 New York USA