LOS ANGELES--(BUSINESS WIRE)--UCLA Health announced today it was a victim of a criminal cyber attack. While the attackers accessed parts of the computer network that contain personal and medical information, UCLA Health has no evidence at this time that the cyber attacker actually accessed or acquired any individual’s personal or medical information. UCLA Health estimates that data on as many as 4.5 million individuals potentially may have been involved in the attack, believed to be the work of