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On December 21 , 2016 , Children 's Hospital Los Angeles learned that an unencrypted laptop containing patient data was stolen from the locked vehicle of a Children 's Hospital Los Angeles Medical Group physician on October 18 , 2016 .
 ( data breach: was stolen,  Children 's Hospital Los Angeles Medical Group physician: victim, patient data: compromised data, October 18 , 2016: time, laptop: victim, Children 's Hospital Los Angeles: victim, December 21 , 2016: time) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( data breach: was stolen,  Children 's Hospital Los Angeles Medical Group physician: victim, patient data: compromised data, October 18 , 2016: time, laptop: victim, Children 's Hospital Los Angeles: victim, December 21 , 2016: time) 