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This past fall , an investment firm rattled the health care industry with unsubstantiated claims of multiple software vulnerabilities in internet - connected pacemakers and cardiac defibrillators .
 ( discover vulnerability: unsubstantiated claims,  multiple software vulnerabilities: vulnerability, internet - connected pacemakers: vulnerable system, cardiac defibrillators: vulnerable system, an investment firm: discoverer) 
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:
 ( discover vulnerability: unsubstantiated claims,  multiple software vulnerabilities: vulnerability, internet - connected pacemakers: vulnerable system, cardiac defibrillators: vulnerable system, an investment firm: discoverer) 