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METHODSTwoepidemiologicmethods,acrosssectionalfolowupstudyandacasecontrolstudy,wereusedfortheevaluationoftheserologicalef...
METHODSTwoepidemiologicmethods, acrosssectionalfolow upstudyandacasecontrol study, wereusedfortheevaluationoftheserologicale ...