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Time: 2024-03-29T13:10:59Z
URL: http://scholar.google.com/scholar_lookup?title=Clinical+trials+of+Shigella+vaccines%3A+two+steps+forward+and+one+step+back+on+a+long%2C+hard+road.&year=2007&author=Levine&journal=Nat.+Rev.+Microbiol.&volume=5&pages=540-553&doi=10.1038%2Fnrmicro1662&pmid=17558427