Randomized trial of UDCA in PBC

A randomized trial of ursodeoxycholic acid in patients with primary biliary cirhossis, conducted at the Mayo Clinic from 1988 to 1992.

A date is missing if a given complication did not arise. It is possible for death, transplant, or withdrawal to occur after the date of the last complete follow-up (they can be ascertained without a patient visit).
sample SAS code to read the data

Reference:Lindor, et al., Gastroenterology, 1994, pages= 1284--1290