Study	Reason for exclusion
Anonymous 1986	Included only patients with hepatitis B.
Brook 1993	Included only patients with hepatitis B.
Cook 1971	Included patients with autoimmune hepatitis.
Giacchino 1988	Included only patients with hepatitis B.
Giacchino 1995	Included only patients with hepatitis B.
Gregorio 1996	Included only patients with hepatitis B.
Hanson 1986	An observational study. Not a randomised clinical trial.
Hoofnagle 1986	Included only patients with hepatitis B.
Krogsgaard 1998	Included only patients with chronic hepatitis B.
Lam 1981	Included only patients with hepatitis B.
Lauta 1995	Compared glucocorticosteroids versus glucocorticosteroids plus interferon for patients with cryoglobulinaemia and chronic hepatitis C.
Lee 1991	Included only patients with hepatitis B.
Liaw 1994a	Included only patients with hepatitis B.
Magrin 1994	Compared to different interferon treatment regimes for patients with chronic hepatitis C.
Manzillo 1983	Included only patients with hepatitis B.
Murray 1973	Included patients with autoimmune hepatitis.
Niederau 1992	Included only patients with hepatitis B.
Perez 1993	Included only patients with hepatitis B.
Schvarcz 1991	A review. Not a randomised clinical trial.
Sjögren 1987	Included only patients with hepatitis B.
Ware 1974	Included patients with hepatitis B.
Ware 1981	Included patients with hepatitis B.
Weller 1982	Included only patients with hepatitis B.
Wu 1982	Included only patients with hepatitis B.
Zarski 1994	Included only patients with hepatitis B.