BrazilSoccerFootballTennisMP3-PlayerBasketballRacquet SportsHockeyAthletesAthletic PerformanceSports EquipmentPopulation DensitySportsBrain ConcussionSeasonsMouth ProtectorsRiversPsychodidaeVolleyballPrevalenceSprains and StrainsGame TheoryInsect VectorsSomatotypesTreesIndians, South AmericanCompetitive BehaviorLeg InjuriesCross-Sectional StudiesGames, ExperimentalSocioeconomic FactorsEye Protective DevicesEndemic DiseasesBertholletiaUrban PopulationPhysical Education and TrainingEpidemiologic MethodsRisk FactorsPhylogenySimuliidaeHead Protective Devices