See, W., Ng, Y. K., Cui, L., Kita, Y., Ooi, S. P.-L., Lee, V., Heng, D. M. K., & Lin, R. T. P. (2021). Singapore’s efforts to achieve measles elimination in 2018. Western Pacific Surveillance and Response, 12(3), 12. https://doi.org/10.5365/wpsar.2019.10.4.002