21681
The corrosion of CoCrMo , an alloy frequently used in orthopedic implants , was studied with an electrochemical quartz crystal microbalance ( QCM ) in three physiologically relevant solutions .
 Chemical: CoCrMo; Chemical: quartz
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: CoCrMo; Chemical: quartz