S K Viswanath1, L Jie2, Q S Meng2, C Yuen1, T Y Tan3. 1. Engineering Product Development, Singapore University of Technology and Design, Singapore. 2. Infection Control, Changi General Hospital, Singapore. 3. Department of Laboratory Medicine, Changi General Hospital, Singapore. Electronic address: thean_yen_tan@cgh.com.sg.