Mitch Keegan reports: The Mankato Clinic has�notified more than 500�patients of a breach of unsecured protected health information. In a intelligence release, Mankato Clinic says on august 3rd an electronic spreadsheet containing patient info for 535 patients was mistakenly e-mailed to a colleague of a Mankato Clinic employee to an external email account. The email was not encrypted. scan more on KeyC.