[1] Kermanshah Univ Technol, Dept Engn Sci, Kermanshah, Iran
[2] Bahcesehir Univ, Fac Engn & Nat Sci, Dept Math, TR-34349 Istanbul, Turkey
[3] Univ Free State, Inst Groundwater Studies, Fac Nat & Agr Sci, ZA-9300 Bloemfontein, South Africa
[4] China Med Univ, China Med Univ Hosp, Dept Med Res, Taichung, Taiwan