Acknowledgements
This manuscript was extracted from the Master’s thesis by Mahla Qomi, which was sponsored by the Vice Chancellor for Research of Shiraz University of Medical Sciences, Shiraz, Iran. Hereby, appreciation goes to the Vice Chancellor for Research of Shiraz University of Medical Sciences for its financial support. The authors would like to thank Clinical Research Development Center of Nemazee Hospital, Dr. Nasrin Shokrpour for editorial assistance, and Mr Ali Mohammad Keshtvarz and Dr Parvin Ghaem Maghami for their assistance in data analysis. We would also like to thank the respectable authorities and personnel of the MS Association, Arak, and all patients who earnestly helped us with this project.