Correction to: Current outlook on radionuclide delivery systems: from design consideration to translation into clinics

After publication of this article, an error was found in the description of the holmium isotopes. (165)Ho is a stable isotope a fraction of which is activated to (166)Ho by neutron activation in a nuclear reactor [2]. In one paragraph of the published article, describing holmium containing QuiremSpheres, (165)Ho should be replaced with (166)Ho. The correct description is given below.