[1] Minhaj Univ Lahore, Dept Math, Lahore, Pakistan
[2] Prince Sultan Univ, Coll Humanities & Sci, Dept Math & Sci, Riyadh 11586, Saudi Arabia
[3] China Med Univ, China Med Univ Hosp, Dept Med Res, Taichung 40402, Taiwan
[4] Hashemite Univ, Fac Sci, Dept Math, POB 330127, Zarqa 13133, Jordan