About the Authors
Communicable Disease Centre, Tan Tock Seng Hospital, Singapore, Singapore
National University of Singapore, Yong Loo Lin School of Medicine, Singapore, Singapore
Yee-Sin Leo is a medical advisor to Sanofi-Pasteur for a dengue vaccine trial. This does not alter the authors' adherence to all the PLOS ONE policies on sharing data and materials.
Conceived and designed the experiments: TLT VCG DCL YSL. Performed the experiments: TLT VCG DCL. Analyzed the data: TLT VCG. Contributed reagents/materials/analysis tools: DCL CFY YSL. Wrote the paper: TLT VCG DCL CFY YSL.