1. Khalid Iqbal:
Department of Physics, The Islamia University of Bahawalpur, Bahawalpur, Pakistan; Shaukat Khanum Cancer Hospital & Research Center, Lahore, Pakistan
2. Saeed Ahmad Buzdar:
Department of Physics, The Islamia University of Bahawalpur, Bahawalpur, Pakistan
3. Muhammad Afzal:
Department of Physics, The Islamia University of Bahawalpur, Bahawalpur, Pakistan