1. Faculty of Dentistry, McGill University, Montreal, Quebec H3A 0C7, Canada
2. Faculty of Dentistry, Benghazi University, Benghazi 9504, Libya
3. Department of Chemistry, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, and Tianjin Collaborative Innovation Center of Chemical Science & Engineering, Tianjin University, Tianjin 300072, P. R. China
4. Physics Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo 11884, Egypt
5. Department of Mining and Materials Engineering, McGill University, Montreal, Quebec H3A 0C5, Canada
6. College of Dental Medicine, Qatar University, Doha, Qatar