Sentence: Visible light-responsive antibacterial photocatalysts ( which have a higher quantum efficiency under sunlight than do UV light-responsive photocatalysts ) can be safely used in indoor settings to prevent human exposure to UV light ( 2 , ( 8 ) ( 9 ) ( 10 ) ( 11 ) ( 13 ) ( 14 ) ( 15 ) ( 16 ). 
 Section: finding