The spectrum expanded: cryptogenic cirrhosis and the natural history of non-alcoholic fatty liver diseasePowell EE, Cooksley WGE, Hanson R, Searle J, Halliday JW, Powell LW. The natural history of nonalcoholic steatohepatitis: a follow-up study of forty-two patients for up to 21 years [Hepatology 1990; 11:74–80]