Received: 25 February 2021
Accepted: 14 July 2021
First Online: 27 July 2021
: The aim and procedures of the study were explained to every participant and an informed written consent was obtained from all participants before being enrolled in the study. The study was approved by the ethical committee of the Neurology Department, Cairo University Hospitals (4/3/2017).
: Not applicable.
: The authors declare that they have no competing interests.