BianLian Threat Group Claims Responsibility for Cyberattack on Tennessee Eye Clinic Network. Politzer and Durocher, PLC, which does business as Optometric Physicians of Middle Tennessee (OPMT), has recently reported a hacking incident to the HHS The BianLian threat group has claimed responsibility for a cyberattack on Optometric Physicians of Middle Tennessee, patient data was stolen in a cyberattack on Somerset Dental Las Vegas, and a breach at Advarra has affected Moffitt Cancer Center patients. Third-party company: Advarra..