Received: 9 April 2019
Accepted: 10 February 2020
First Online: 19 February 2020
Ethics approval and consent to participate
: The study was approved by the ethical committee of the Department of Neurology and Clinical Neurophysiology, Faculty of Medicine, Cairo University on May 30th, 2015. All subjects provided informed written consent to participate in the study. The clinical trial registration number is NCT03446066.
: Not applicable.
: The authors declare that they have no competing interests.