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OBJECTIVE : The authors compared 4 - month treatment outcomes for olanzapine versus risperidone in patients with first - episode schizophrenia spectrum disorders .
 Chemical: olanzapine; Chemical: risperidone; Disease: schizophrenia
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: olanzapine; Chemical: risperidone; Disease: schizophrenia