Intra-arterial versus standard intravenous administration of lutetium-177-DOTA-octreotate in patients with NET liver metastases: study protocol for a multicenter, randomized controlled trial (LUTIA trial) - Ebbers, S C; Braat, A JAT; Moelker, A; Stokkel, M PM; Lam, M GEH; Barentsz, M W (Trials, 2020)