1. Department of Chemistry, Faculty of Science, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
2. College of Humanities and Sciences, National University of Singapore, 21 Lower Kent Ridge Road, Singapore 119077
3. Centre for Teaching, Learning and Technology, National University of Singapore,15 Kent Ridge Road, Singapore 119225
4. NUS Environmental Research Institute (NERI), #02-01, T-Lab Building (TL), 5A Engineering Drive 1, Singapore 117411, Singapore