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To determine the prevalence of heart disease in outpatient young asymptomatic chronic cocaine users , 35 cocaine users and 32 age - matched controls underwent resting and exercise electrocardiography ( ECG ) and Doppler echocardiography .
 Disease: heart disease; Chemical: cocaine; Chemical: cocaine
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: heart disease; Chemical: cocaine; Chemical: cocaine