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Reversible leukopenia was documented in an 81-year-old woman treated with adjunctive ibopamine 100 mg t.i.d. for chronic congestive heart failure.
 adverse event: documented 
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: documented 