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The authors postulate that two types of combined lithium-neuroleptic toxicity occur: a neuroleptic malignant extrapyramidal syndrome and a lithium toxicity that occurs in combination with phenothiazines, primarily thioridazine.
 adverse event: occur:
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: adverse event, potential therapeutic event 
Text: {0} 
Answer:
 adverse event: occur: