Stomach VolvulusOnchocerca volvulusIntestinal VolvulusStomachGastrointestinal TractOnchocerciasisOnchocercaDigestive SystemSimuliidaeIvermectinIntestinal ObstructionCecal DiseasesDigestive System Physiological PhenomenaStomach NeoplasmsOnchocerciasis, OcularUpper Gastrointestinal TractGastrointestinal NeoplasmsMicrofilariaStomach DiseasesDuodenal NeoplasmsIntestine, SmallColon, SigmoidGastrointestinal DiseasesGastric MucosaIntestinal MucosaAntigens, HelminthIntestinesGastrointestinal MotilityLower Gastrointestinal TractDuodenal DiseasesJejunumIleumDigestive System AbnormalitiesColonic DiseasesColonFilaricidesDuodenal ObstructionCecumStomach UlcerIntestine, LargeIntestinal AbsorptionMansonelliasisDNA, HelminthAntibodies, HelminthDigestive System Surgical ProceduresPyloric AntrumEndoscopy, GastrointestinalDuodenumUrinary Tract InfectionsTorsion AbnormalityJejunal Diseases