Murray M. Fisher, Eve A. Roberts, Irvine E. Rosen, Theodore F. Shapero, Lloyd R. Sutherland, Robert S. Davies, Raymond Bacchus, S. Victor Lee – 1 January 1985 – The Sunnybrook Gallstone Study was a randomized, double‐blind, controlled trial of chenodeoxycholic acid treatment over 2 years in 160 patients with radiolucent gallstones. Sixty‐four patients received 750 mg daily, 53 received 375 mg daily and 43 received placebo. Total dissolution of gallstones occurred in 10.9% of patients on 750 mg daily, 13.2% of those on 375 mg daily and in no patient on placebo. The drug was tolerated well.