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With affected institutions including the Health Service Executive ( which said it prevented the ransomware from activating ) , the National Health Service in the UK , FedEx and PetroChina , few initially paid up , leading to speculation that organisations were taking their chances on fixing their corrupt machines before the ransom forced a mass deletion of critical data .
 ( ransom: paid up,  the National Health Service: victim, FedEx: victim, the UK: place, institutions: victim, the Health Service Executive: victim, PetroChina: 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: paid up,  the National Health Service: victim, FedEx: victim, the UK: place, institutions: victim, the Health Service Executive: victim, PetroChina: victim) 