1. Department of Plant Sciences, Quaid-i-Azam University, Islamabad, Pakistan
2. Department of Pharmacognosy (Medicinal, Aromatic and Poisonous Plants Research Center), College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
3. Chemistry of Medicinal Plants Department, National Research Centre, Dokki, Giza, Egypt
4. Department of Plant Sciences, University of California, Davis, CA, USA