The prevalence of hepatitis C virus infection in the United States, 1988 through 1994 - Alter,M.J.; Kruszon-Moran,D.; Nainan,O.V.; McQuillan,G.M.; Gao,F.; Moyer,L.A.; Kaslow,R.A.; Margolis,H.S. (N Engl J Med, 1999)