<prompt> Translate the following text to EnglishKwa hivyo, ikiwa tunafanya utafiti wa kesi za 4, 10, au 15 kwa njia ya utafiti wa kesi, tunaweza kuwa na wasiwasi juu ya hatari za kuelezea kwa ujumla.  <response>: Using 4, 10, or 15 sites as case studies might be feasible, but we would still need to be concerned about the risks in generalizability. 