<prompt> Translate the following text to EnglishAlisema kuwa kuna mambo machache yanayojulikana kuhusu uchunguzi wa ufanisi kwa idadi fulani ya watu, kwa hiyo utafiti wa uchunguzi bado una nafasi yake.  <response>: He noted that little is known about effective screening for certain sub-populations, so screening research still has its place. 