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A spokesperson for Dorset County Hospital said : “ On January 19 2017 Dorset County Hospital NHS Foundation Trust received a letter which informed us that there had been an information security breach on one of the servers at Landauer UK , a third party organisation who supply our Dosimetry service , an externally provided service that monitors , analyses and reports on the radiation dosages that staff who regularly use radioactive equipment and devices are exposed to .
 ( data breach: an information security breach,  the servers: victim, Landauer: victim, UK: place) 
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: an information security breach,  the servers: victim, Landauer: victim, UK: place) 