1. Department of Mathematics, Gilan-E-Gharb Branch, Islamic Azad University, Gilan-E-Gharb, Iran
2. Department of Mathematics, Bonab Branch, Islamic Azad University, Bonab, Iran
3. Department of Mathematics, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran
4. Department of Medical Research, China Medical University Hospital, China Medical University (Taiwan), Taichung, Taiwan