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Luby, S. P., M. K. Faizan, S. P. Fisher-Hoch, A. Syed, E. D. Mintz, Z. A. Bhutta, and J. B. McCormick. Risk Factors for Typhoid Fever in an Endemic Setting, Karachi, Pakistan. Cambridge University Press, 1998.

Luby, S. P., et al. Risk Factors for Typhoid Fever in an Endemic Setting, Karachi, Pakistan. Cambridge University Press, 1998.