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Relation of perfusion defects observed with myocardial contrast echocardiography to the severity of coronary stenosis : correlation with thallium - 201 single - photon emission tomography .
 Disease: coronary stenosis; Chemical: thallium
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Disease: coronary stenosis; Chemical: thallium