antibiotic resistance autonomic testing bic Book Industry Communication::M Medicine bile acids brain energy crisis capsules cirrhosis cognitive function coma delirium dietary intervention encephalopathy enema epidemiology gluconeogenesis hepatic encephalopathy hospitalizations hyperammonemia idiopathic non-cirrhotic portal hypertension ketogenesis liver liver cirrhosis liver disease liver failure minimal hepatic encephalopathy mitochondria mortality myosteatosis n/a nerve conduction