Received: 6 February 2019
Accepted: 12 November 2019
First Online: 10 December 2019
Ethics approval and consent to participate
: This observational study was approved by the ethics committee of the Department of Neurosurgery, Kasr Alainy Faculty of Medicine, Cairo University on the 9th of December 2015. All participants provided informed written consent to participate in the study.
: Informed written consent to publish has been obtained from the participants to report individual patient data.
: The authors declare that they have no competing interests.