<prompt> Translate the following text to SwahiliIt is not always clear whether there were long-term positive outcomes from these trials since referral has been the outcome variable most often studied.  <response>: Haijulikani wazi kama matokeo mazuri ya muda mrefu yalitokea kutokana na majaribio haya, kwani kuelekezwa kwa matibabu ndiyo iliyokuwa variable ya matokeo iliyochunguzwa mara nyingi. 