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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 > 1996 > 90 > 3 > 298-301
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 > 1996 > 90 > 3 > 298-301