Liu Y, Xiong Y, Liang Y, Deng X, et al. Waning immunity and potential asymptomatic infection in 3-7 years old children
who received one dose of measles-mumps-rubella vaccine: A 4-year prospective
study. Vaccine 2021 May 13. pii: S0264-410X(21)00559.
PMID: 33994238