1. United States Food and Drug Administration Medical Device Recalls. http://www.fda.gov/Safety/MedWatch/SafetyInformation/SafetyAlertsforHumanMedicalProducts/ucm298710.htm.
2. Thoratec Corporation Medical Device Correction Notification. 23 Feb 2012. http://www.mdco.gov.hk/english/recalls/files/thor.pdf