<prompt> Translate the following text to SwahiliTo determine the best of the available screens, a multi-center trial with a broad demographic mix and a large number of patients subjected to different screens is needed.  <response>: Ili kuamua bora ya skrini zilizopo, majaribio ya kituo cha multicenter na mchanganyiko mkubwa wa idadi ya watu na idadi kubwa ya wagonjwa waliofanyiwa skrini tofauti zinahitajika. 