 The second, standard matched case-control studies (CC) demands that one person who accompanies the symptomatic persons to the test facility is asked the same information .
<clarity>  The second, standard matched case-control studies (CC) demands that one person who accompanies the symptomatic persons to the test facility is asked the same information .
 The second, standard case-control studies (CC) demands that one person who accompanies the symptomatic persons to the test facility is asked the same information .