Current State of Brazilian Neurosurgery: evaluation of burden of care and case volume - Koester, Stefan W; Bertani, Raphael; Batista, Savio; Bishay, Anthony E; Perret, Caio; Dewan, Michael C; Paiva, Wellingson; Campos, Wuilker Knoner; Figueiredo, Eberval Gadelha (World neurosurgery, 2023)