<prompt> Translate the following text to SwahiliTo reflect concerns about the inherent limitations in the number of studies supporting a causal association between long-term exposure and mortality, an Alternative benefit estimate was derived from the large number of time-series studies that have established a likely causal relationship between short-term measures of PM and daily mortality statistics.  <response>: Ili kutafakari wasiwasi kuhusu mapungufu ya asili katika idadi ya masomo yanayounga mkono uhusiano wa kisababishi kati ya mfiduo wa muda mrefu na vifo, makadirio ya faida ya mbadala yalitokana na idadi kubwa ya masomo ya mfululizo wa wakati ambayo yameweka uhusiano wa kisababishi kati ya vipimo vya muda mfupi vya PM na takwimu za vifo vya kila siku. 