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The UK 's National Health Service was particularly badly hit by the attack , with hospitals and doctor 's surgeries knocked offline , and some services not restored until days after the ransomware hit .
 ( ransom: hit,  The UK 's National Health Service: victim) 
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:
 ( ransom: hit,  The UK 's National Health Service: victim) 