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Hughes, Stefanie L., Bolotin, Shelly, Durrheim, David N., Orenstein, Walter A., Moss, William J., Jit, Mark, Crowcroft, Natasha S., Khan, Sumaiya, Li, Ye, Johnson, Caitlin, Friedman, Lindsay, Tricco, Andrea C., Hahné, Susan J. M., Heffernan, Jane M., Dabbagh, Alya. Elsevier; 2020. The effect of time since measles vaccination and age at first dose on measles vaccine effectiveness: A systematic review.