1. Department of Chemistry, College of Science, University of Jeddah, 21589 Jeddah, Saudi Arabia
2. Department of Clinical Microbiology and Infectious Diseases, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, South Africa
3. Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Medicine, University of Pittsburgh Medical Center, Pittsburgh, PA, 15213, USA