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In other individuals with no underlying atherosclerotic obstruction , coronary occlusion may be due to spasm , thrombus , or both .
 atherosclerotic obstruction, coronary occlusion, spasm, thrombus
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 atherosclerotic obstruction, coronary occlusion, spasm, thrombus