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Biochemical and hormonal indices of calcium and bone metabolism were measured throughout the study , and bone biopsies were done at baseline , 60 weeks after OCT or vehicle treatment , and at the end of the crossover period .
 Chemical: calcium; Chemical: OCT
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:
 Chemical: calcium; Chemical: OCT