Received: 20 August 2019
Accepted: 23 January 2020
First Online: 19 February 2020
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 5th of May 2017, but Cairo University does not provide the approval reference number.
: Not applicable
: The authors declare that they have no competing interests.