6[1]Zeegen R, Drinkwater J W, Dawson A M. Method for measuring cerebral dysfunction in patients with liver disease[J]. British Medical Journal , 1970,2(1):633-636.
7[2]Rikkers L, Jenko P, Rudman D,et al. Subclinical hepatic encephalopathy: detection, prevalence, and relationship to nitrogen metabolism[J].Gastroenterology,1978,75(3):462-469.
8[3]Gitlin N. Subclinical portal-systemtic encephalopathy[J]. The American Journal of Gastroenterology, 1988,83(1):8-11.
9[5]Sood G K, Sarin S K, Mahaptra J, et al. Comparative efficacy of psychometric tests in detection of subclinical hepatic encephalopathy in nonalcoholic cirrhosis: Search for a rational approach[J]. The American Journal of Gastroenterology,1989,84(2):156-159.
10[7]Elsass P, Christensen S E, Ranek L, et al. Continous reaction time in patients with hepatic encep-halopathy: a quantitative measure of continous reaction times[J]. Liver, 1985,5(1):29.