1. Department of Neurology, Massachusetts General Hospital, Harvard University, Boston, MA, USA
2. Department of Dermatology, Aleppo University, Aleppo, Syrian Arab Republic
3. Department of Otolaryngology – Head and Neck Surgery, Johns Hopkins University, Baltimore, MD, USA
4. Department of General Internal Medicine, Aleppo University, Aleppo, Syrian Arab Republic
5. Department of Gastroenterology, Aleppo University, Aleppo, Syrian Arab Republic