Comment on

• The effect of ursodiol on the efficacy and safety of extracorporeal shock-wave lithotripsy of gallstones. The Dornier National Biliary Lithotripsy Study.

  Schoenfield LJ, Berci G, Carnovale RL, Casarella W, Caslowitz P, Chumley D, Davis RC, Gillenwater JY, Johnson AC, Jones RS, et al. Schoenfield LJ, et al. N Engl J Med. 1990 Nov 1;323(18):1239-45. doi: 10.1056/NEJM199011013231804. N Engl J Med. 1990. PMID: 2215608 Clinical Trial.