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A 61-year-old man developed clinical lupus syndrome with positive antinuclear antibody, positive lupus erythematosus (LE) cell preparation, and diffuse proliferative glomerulonephritis following 26 months of procainamide therapy.
 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 