Received: 7 January 2020
Accepted: 18 February 2020
First Online: 5 March 2020
Ethics approval and consent to participate
: The study was approved by the ethical committee of the Department of Neurology, Faculty of Medicine, Cairo University, on the 15th of October 2018, but Cairo University does not provide the approval reference number. All procedures performed in the study were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki Declaration and its later amendments.
: Not applicable
: The authors declare that they have no competing interests.