Large-scale Use of Sabin Type 2 Attenuated Poliovirus Vaccine in Singapore During a Type 1 Poliomyelitis EpidemicBr Med J 1959; 1 doi: https://doi.org/10.1136/bmj.1.5137.1541 (Published 20 June 1959) Cite this as: Br Med J 1959;1:1541
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