713
Two patients, each receiving warfarin for stroke prophylaxis in association with chronic atrial fibrillation, developed adverse effects after the initiation of tolterodine for urinary disorders.
 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 