1. Department of Neurology, Bushehr University of Medical Sciences, Bushehr, Iran
2. The Persian Gulf Tropical Medicine Research Center, Bushehr University of Medical Sciences, Bushehr, Iran
3. Department of Pathology, Rasul-e Akram Hospital, Iran University of Medical Sciences, Tehran, Iran
4. Department of Neurology, Yasuj University of Medical Sciences, Yasuj, Iran
5. Department of Gastroenterology and Hepatology, Bushehr University of Medical Sciences, Bushehr, Iran
6. The Persian Gulf Nuclear Medicine Research Center, Bushehr University of Medical Sciences, Bushehr, Iran