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Article History

Received: 6 February 2018

Accepted: 4 October 2018

First Online: 3 November 2018

Ethics approval and consent to participate

: The aim and procedures of the study were explained to every participant, and all participants provided informed written consent to participate in the study. The study was approved by the ethical committee of the Department of Neurology, Faculty of Medicine, Cairo University, on 20/10/2014, but Cairo University does not provide approval reference number.

: Not applicable.

: The authors declare that the research was conducted in the absence of any commercial relationships that could be constructed as a potential conflict of interest.

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