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Transactions of the Royal Society of Tropical Medicine and Hygiene > 2000 > 94 > 5 > 563-568
Transactions of the Royal Society of Tropical Medicine and Hygiene > 1999 > 93 > 5 > 552-557
Transactions of the Royal Society of Tropical Medicine and Hygiene > 2000 > 94 > 5 > 563-568
Transactions of the Royal Society of Tropical Medicine and Hygiene > 1999 > 93 > 5 > 552-557