1. Department of Pharmaceutics and Biopharmaceutics, University of Marburg, Marburg, Germany;
2. Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Helwan University, Cairo, Egypt;
3. Department of Pharmaceutics, Faculty of Pharmacy, Ahram Canadian University, Giza, Egypt;
4. Department of Pharmacy, Biopharmaceutics and Pharmaceutical Technology, Saarland University, Saarbrücken, Germany