Agricultural Workers' DiseasesAgriculturePesticidesOccupational ExposureOrganophosphate PoisoningGas PoisoningTransients and MigrantsPhosmetDustCentral AmericaAccidents, OccupationalChlorpyrifosOccupational DiseasesButyrylcholinesteraseOccupational HealthAir Pollutants, OccupationalResearchOccupationsPesticide ResiduesPolandAcetylcholinesteraseCarbamatesCholinesterase InhibitorsInsecticidesIndiaRural PopulationOrganophosphorus CompoundsQuestionnairesRisk FactorsResearch Support as TopicResearch DesignEthics, ResearchWorkers' CompensationResearch PersonnelSex Workers