Presence of mutations in the bile salt excretory pump gene in two families with pediatric cholangiocarcinoma and PFIC: Ann O Scheimann, Johns Hopkins Hospital, Baltimore, MD; Wikrom Karnsakul, Baylor Coll of Medicine, Houston, TX; Sandra Strautnieks, Richard J Thompson, King's College Hospital, London Uk; George D Ferry, Baylor Coll of Medicine, Houston, TX; G S Gopalakrishna, Pediatric Digestive Disease Specialists, Houston, TX; R P Wood, Claire F Ozaki, University of Texas-Houston, Houston, TX; Humberto E Soriano, Northwestern, Chicago, IL; Martha Munden, Milton J Finegold, Baylor Coll of Medicine, Houston, TX