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We report a 59-year-old patient with chronic myeloid leukemia, who developed severe interstitial lung fibrosis after short term and sequential treatment with melphalan and busulfan.
 adverse event: developed 
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: developed 