3524
In group I during the pain free period 26 of 81 patients had positive thallium - 201 scans , whereas 20 patients had an abnormal ECG at that time ; during angina 18 patients had transient ECG changes .
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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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