Received: 28 January 2019
Accepted: 3 July 2019
First Online: 15 July 2019
Ethics approval and consent to participate
: Informed written consent was taken from each patient. All data obtained from every patient were confidential and were not used outside the study. The patients have the rights to withdraw from the study at any time without giving any reason. All the cost of the investigations was afforded by the researcher.Our study was approved by the ethical committee of the Department of Neurology, Faculty of Medicine, Cairo University, on 11th of November 2017, but Cairo University does not provide the approval reference number.
: Not applicable.
: The authors declare that they have no competing interests.