Email Breach Affects 10,000 University of Chicago Medical Center Patients. Hackers gained access to the email accounts of University of Chicago Medical Center employees and the data of more than 10,000 patients. An HIPAA email Hackers gained access to the email accounts of University of Chicago Medical Center employees and the data of more than 10,000 patients. An email breach at Newton Centre Dental has affected 2,550 patients. University of Chicago Medical Center (UCMC) has completed reviewing the email accounts of a small number of employees who had their accounts accessed by an unauthorized individual earlier this year and has confirmed that the accounts contained the protected health information of 10,332 patients. Third-party company: Affinity Dental Management.