1. Department of Epidemiology and Preventive Medicine, Sackler Faculty of Medicine, School of Public Health, Tel-Aviv University, Tel-Aviv, Israel.
2. Department of Microbiology and Immunology, WHO Collaborating Center for Research on Enterotoxigenic Escherichia coli (ETEC), Institute of Biomedicine, Göteborg University, Göteborg, Sweden.
3. Medical Corps, Israel Defense Forces, Tel-Aviv, Israel.
4. Department of Pediatrics, Faculty of Medicine, Carmel Medical Center and Technion-Israel Institute of Technology, Haifa, Israel.