Cluster 166: gilbert bilirubin uln upper normal limit total syndrome unless disease Cluster 797: bilirubin total gilbert mg dl syndrome uln subjects patients serum Cluster 1484: gilbert syndrome history known disease diagnosis patients eligible bilirubin glucuronidation Cluster 1760: gilbert bilirubin uln total syndrome unless documented disease serum patients Cluster 1909: liver gallstones biliary disease asymptomatic gilbert exception chronic syndrome assessment Cluster 2042: bilirubin total gilbert normal syndrome upper mg dl limit institutional Cluster 2285: gilbert mg dl bilirubin syndrome total unless hemolysis disease known Cluster 2444: bilirubin uln gilbert total direct syndrome normal patients range serum