Pivotal <i>Shigella</i> Vaccine Efficacy Trials—Study Design Considerations from a <i>Shigella</i> Vaccine Trial Design Working Group oleh Patricia B. Pavlinac, Elizabeth T. Rogawski McQuade, James A. Platts-Mills, Karen L. Kotloff, Carolyn Deal, Birgitte K. Giersing, Richard A. Isbrucker, Gagandeep Kang, Lyou-Fu Ma, Calman A. MacLennan, Peter Patriarca, Duncan Steele, Kirsten S. Vannice