29091
METHODS : Using data from DCEs aimed at determining valuations of attributes of osteoporosis drug treatments and human papillomavirus ( HPV ) vaccinations , we empirically compared RRM models , RUM models and Hybrid RUM - RRM models in terms of goodness of fit , parameter ratios and predicted choice probabilities .
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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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