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Transactions of the Royal Society of Tropical Medicine and Hygiene > 1998 > 92 > 2 > 201-206
Transactions of the Royal Society of Tropical Medicine and Hygiene > 1997 > 91 > 3 > 331-334
Transactions of the Royal Society of Tropical Medicine and Hygiene > 1997 > 91 > 3 > 322-327
Transactions of the Royal Society of Tropical Medicine and Hygiene > 1997 > 91 > 2 > 195-198