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Flowchart of the study design. (a) Nationwide 2018–2020 childhood vaccination coverage as retrieved from the immunization records at the Ministry of Health. (b) Survey-based study of routine childhood vaccination coverage during COVID-19 pandemic 2020-2021. BCG: Bacillus Calmette–Guérin; DPT: diphtheria, pertussis, and tetanus; MMR: measles, mumps, and rubella; MOH: Ministry of Health; OPV: oral polio vaccine.
