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In a staggered cross - sectional design , we tested associations with coronary artery calcium ( CAC ) , measured by computed tomography a median of 10 years later , and with common and internal carotid intima - media thickness ( IMT ) , measured by B - mode ultrasonography on two occasions a median of 4 years later and a median of 10 years later .
 Chemical: calcium
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: calcium