1. Nanotechnology and Catalysis Research Center, Institute for Advanced Studies, Universiti Malaya, Kuala Lumpur 50603, Malaysia
2. Department of Biomedicine, Faculty of Biology, Bielefeld University, Bielefeld D-33615, Germany
3. Mechanical, Automotive & Materials Engineering, Faculty of Engineering, University of Windsor, Windsor, Ontario (ON) N9B 3P4, Canada