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A cross - sectional survey revealed that serum BDNF levels in chronic schizophrenic patients treated with clozapine exceeded those of patients treated with risperidone or with typical antipsychotics .
 Chemical: clozapine; Chemical: risperidone
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: clozapine; Chemical: risperidone