1. Atta-ur-Rahman School of Applied Biosciences; National University of Sciences and Technology; H-12 Kashmir Highway Islamabad 44000 Pakistan
2. Natural Products Research Unit, Department of Biological and Biomedical Sciences; The Aga Khan University Medical College; Karachi 74800 Pakistan
3. College of Health Sciences; Mekelle University; PO Box 1871 Mekelle Ethiopia