Child Day Care CentersNurseriesNasopharyngeal DiseasesBrazilIntestinal Diseases, ParasiticWisconsinBronchopulmonary DysplasiaRespiratory Tract InfectionsRespiratory SoundsCarrier StateInfectionCoughRisk FactorsInfant, NewbornPrevalencePrecursor Cell Lymphoblastic Leukemia-LymphomaCase-Control StudiesProspective Studies