Kubura kumva ni ikibazo cyubuzima gikunze kwibasira abantu babarirwa muri za miriyoni kwisi.Irashobora guterwa nimpamvu zitandukanye, zirimo genetiki, gusaza, kwandura, no guhura n urusaku rwinshi.Rimwe na rimwe, kutumva birashobora guhuzwa n'imyuga imwe n'imwe inv ...
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