1. Pharmaceutics Department, Faculty of Pharmacy, Helwan University, Cairo, Egypt;
2. International Center for Bioavailability, Pharmaceutical and Clinical Research (ICBR), Cairo, Egypt;
3. Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Al-Azhar university, Cairo, Egypt;
4. Metered Dose Inhaler Department (MDI), Cairo, Egypt;
5. Arab Drug Company for pharmaceuticals and chemical industries (ADCO), Cairo, Egypt