1. Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Kafrelsheikh University, P.O. Box 33511, Kafrelsheikh, Egypt
2. Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Mansoura University, P.O. Box 35516, Mansoura, Egypt
3. Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, 20N. Pine Street, Baltimore, MD 21201, USA