<prompt> Translate the following text to EnglishUtafiti huu unaonyesha kuwa hatari ya muda mfupi inaweza kuongezeka mara mbili wakati athari za siku moja zinapochanganywa na athari ya jumla ya mfiduo kwa siku nyingi hadi wiki kabla ya tukio la vifo.  <response>: These studies suggest that the short-term risk can double when the single-day effects are combined with the cumulative impact of exposures over multiple days to weeks prior to a mortality event. 