作者单位：Naval Medical Research Center, Silver Spring, MD, United States[1]Enteric Diseases Department, Naval Medical Research Center, Silver Spring, MD, United States[2]Naval Health Research Center, San Diego, CA, United States[3]US Naval Medical Research Unit, No. 3, Cairo, Egypt[4]Department of Preventive Medicine and Biometrics, Uniformed Services University of the Health[5]
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