Letter to the Editor Regarding Effects of the COVID-19 Outbreak in Northern Italy: Perspectives from the Bergamo Neurosurgery Department, and the Role of Radiosurgery as a Minimally Invasive Procedure for Primary Central Nervous System Lymphoma in the Pandemic Outbreak. - Alvarez Pinzon AM; Wolf AL; Delgado V; Valerio JE; González A; Alonso JR (World neurosurgery, 2020)