title: Response.
authors.affiliation: a Royal Victoria Infirmary , Newcastle upon Tyne , UK.
authors.forename: Justin
authors.initials: J
authors.lastname: Nissen
authors.affiliation: b Royal Victoria Infirmary, Neurosurgery , Leazes Wing, Queen Victoria Road , Newcastle Upon Tyne , NE1 4LP United Kingdom , cyril7@doctors.org.uk.
authors.forename: Jerome Laval Cyril
authors.initials: JL
authors.lastname: Dubois