1. Department of ChemistryJamia Millia Islamia New Delhi 110025 India
2. Clinical Microbiology and Infectious Diseases, School of Pathology, Faculty of Health SciencesUniversity of the Witwatersrand Johannesburg 2193 South Africa
3. Chemistry Department, Faculty of ScienceUniversity of Jeddah Jeddah Kingdom of Saudi Arabia
4. Infection Control, Charlotte Maxeke Johannesburg Academic HospitalNational Health Laboratory Service Johannesburg 2193 South Africa