596
To evaluate the relative accuracy of continuous wave ( CW ) and high pulse repetition frequency ( HPRF ) Doppler for estimating aortic transvalvular pressure gradients , Doppler examinations with both devices were obtained in 87 consecutive patients with aortic valve disease .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
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