( ( Infection ( of ( ( ( ( ( the ( ear canal ) ) ( -LRB- ( ( otitis externa ) -RRB- ) ) ) ( ( ( Excessive scratching ) ( of ( ( the ( ear canal ) ) ( with match ) ) ) ) sticks ) ) or ) ( hair pins ) ) ) ) ( ( leads ( ( ( to ( trauma ( in ( the ( ear canal ) ) ) ) ) and ) ( to ( subsequent infection ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Infection)) (PP (IN of) (NP (NP (NP (DT the) (NN ear) (NN canal)) (PRN (-LRB- -LRB-) (NP (JJ otitis) (NN externa)) (-RRB- -RRB-)) (SBAR (S (NP (NP (NNP Excessive) (NNP scratching)) (PP (IN of) (NP (NP (DT the) (NN ear) (NN canal)) (PP (IN with) (NP (NN match)))))) (VP (VBZ sticks))))) (CC or) (NP (NN hair) (NNS pins))))) (VP (VBZ leads) (PP (PP (TO to) (NP (NP (NN trauma)) (PP (IN in) (NP (DT the) (NN ear) (NN canal))))) (CC and) (PP (TO to) (NP (JJ subsequent) (NN infection))))) (. .)))
Infection of the ear canal ( otitis externa ) Excessive scratching of the ear canal with match sticks or hair pins leads to trauma in the ear canal and to subsequent infection.
(ROOT (NP (NP (NP (DT The) (NN hair) (NNS cells) (NN sense)) (PRN (-LRB- -LRB-) (PRP s) (-RRB- -RRB-))) (NP (NP (DT the) (NN movement)) (PP (IN of) (NP (ADJP (JJ liquid) (PP (IN in) (NP (NN ear)))) (NNS canals)))) (. .)))