Cystic fibrosis is the commonest fatal hereditary disease.囊性纤维化是最常见的致命性遗传疾病。Cystic fibrosis is the most common fatal genetic disease in the United States.囊性纤维化是美国最常见的致命遗传疾病。Nonalcoholic fatty liver disease may progress to liver fibrosis and cirrhosis.非酒精性脂肪肝疾病可能会进一步导致肝纤维化和肝硬化。