title: A tribute to Professor Leslie Paul Ivan (1920-2015).
authors.affiliation: Division of Neurosurgery, Children's Hospital of Eastern Ontario, Ottawa, ON, Canada. enriqueventureyra@gmail.com.
authors.forename: Enrique C G
authors.initials: EC
authors.lastname: Ventureyra
authors.affiliation: Division of Neurology, The Ottawa Hospital, Ottawa, ON, Canada.
authors.forename: Robert F
authors.initials: RF
authors.lastname: Nelson
mesh_terms: D002170:Canada; D049673:History, 20th Century; D049674:History, 21st Century; D006801:Humans; D006814:Hungary; D000069471:Neurosurgeons / Q000266:history*; D010372:Pediatrics / Q000266:history