Received: 6 October 2021
Accepted: 5 February 2022
First Online: 19 February 2022
: 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. (15/1/2019).
: Not applicable.
: The authors declare that they have no competing interests (financial and non-financial). We declare that the research was conducted in absence of any commercial relationships that could be constructed as a potential conflict of interest.