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Journal
Lancet
Volume
336
Issue
8720
Pages
891-4
Publication year
1990
Suggested citation
Levine MM, Ferreccio C, Cryz S, Ortiz E. Comparison of enteric-coated capsules and liquid formulation of Ty21a typhoid vaccine in randomised controlled field trial. Lancet. 1990; 336(8720): 891-4.