1. Department of Pharmacognosy, Faculty of Pharmacy, Alexandria University, Alexandria, Egypt
2. Department of Pharmacognosy, School of Pharmacy, Addis Ababa University, Addis Ababa, Ethiopia
3. Centre for Pharmacognosy and Phytotherapy, The School of Pharmacy, London University, London, UK
4. Department of Pharmacognosy, Faculty of Pharmacy, Suez Canal University, Ismailia, Egypt