( ( ( 2.2 Noise-Induced ) ( Hearing ( Loss ( ( -LRB- ( NIHL -RRB- ) ) NIHL ) ) ) ) ( ( is ( ( caused ( by exposure ) ) ( to ( sound ( ( ( levels or ) durations ) ( that ( damage ( ( the ( hair cells ) ) ( of ( the cochlea ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (ADJP (NP (CD 2.2)) (JJ Noise-Induced)) (NNP Hearing) (NNP Loss) (PRN (-LRB- -LRB-) (NP (NNP NIHL)) (-RRB- -RRB-)) (NNP NIHL)) (VP (VBZ is) (VP (VBN caused) (PP (IN by) (NP (NN exposure))) (S (VP (TO to) (VP (VB sound) (NP (NP (NNS levels) (CC or) (NNS durations)) (SBAR (WHNP (WDT that)) (S (VP (VBP damage) (NP (NP (DT the) (NN hair) (NNS cells)) (PP (IN of) (NP (DT the) (NN cochlea))))))))))))) (. .)))
2.2 Noise-Induced Hearing Loss (NIHL) NIHL is caused by exposure to sound levels or durations that damage the hair cells of the cochlea.
(ROOT (S (NP (NNP Loud)) (VP (VBZ sounds) (SBAR (IN that) (S (NP (NN cause) (NN hearing) (NN loss)) (VP (VBP damage) (NP (NP (DT the) (NN hair) (NNS cells)) (PP (IN in) (NP (DT the) (JJ inner) (NN ear)))))))) (. .)))