( ( Performance Normally ) ( , ( doctors ( ( use ( ( ( a device ) ( with ( a ( mercury column ) ) ) ) ( ( called ( a sphygmomanometer ) ) ( to ( ( measure ( blood pressure ) ) ( -LRB- ( ( the ( Korotokoff method ) ) -RRB- ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (S (NP (NNP Performance)) (ADVP (RB Normally))) (, ,) (NP (NNS doctors)) (VP (VBP use) (SBAR (S (NP (NP (DT a) (NN device)) (PP (IN with) (NP (DT a) (NN mercury) (NN column)))) (VP (VBD called) (NP (DT a) (NN sphygmomanometer)) (PP (TO to) (NP (NP (NN measure) (NN blood) (NN pressure)) (PRN (-LRB- -LRB-) (NP (DT the) (NN Korotokoff) (NN method)) (-RRB- -RRB-)))))))) (. .)))
Performance Normally, doctors use a device with a mercury column called a sphygmomanometer to measure blood pressure (the Korotokoff method).
(ROOT (S (NP (NNP Sphygmomanometer)) (VP (VBZ is) (VP (VBN used) (S (VP (TO to) (VP (VB measure) (NP (NN blood) (NN pressure))))))) (. .)))