Retinoblastoma is the most common intraocular malignancy. Its incidence has been reported to be 1 case in from 15 000 18 live births, or approximately 12, 6, 4 cases per million children younger than 5, 10, years, respectively.1,2 The aim of this study was estimate retinoblastoma across European countries within a 1-year time frame. Data were collected through an international, multicenter, cro...

We report Zeeman infra-red spectroscopy of electronic-nuclear levels 5I8 →5I7 transitions Ho3+ in the C4v(F−) centre CaF2 with magnetic field along ⟨111⟩ direction crystal. Transitions to lowest 5I7 state, an isolated electronic doublet, and next group states, a pseudo-quadruplet consisting doublet two nearby singlets, exhibit strongly non-linear splittings intensity variations. Simulated spect...