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RESEARCH DESIGN AND METHODS We used a cost - effectiveness simulation model to estimate the cost - effectiveness of vaccinating adults 20 - 59 years of age with diagnosed diabetes not previously vaccinated for or infected by hepatitis B virus ( HBV ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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