primary studies published RCT The effect of treatment with ursodeoxycholic acid in cystic fibrosis and hepatopathy: results of a placebo-controlled study. Year: 1991 Date: 1991 Author: Bittner P Source Bile acids as therapeutic agents. From basic science to clinical practice. Falk symposium 58. YR: 1991 DE: RCT Study design (if review, criteria of inclusion for studies) RCT