Occurrence of seeding metastases in resectable perihilar cholangiocarcinoma and the role of low-dose radiotherapy to prevent this. - Franken LC; Roos E; Saris J; van Hooft JE; van Delden OM; Verheij J; Erdmann JI; Besselink MG; Busch OR; van Tienhoven G; van Gulik TM (World journal of hepatology, 2020)