TUESDAY, July 23, 2019 (HealthDay News) -- Nearly three years ago, U.S. diplomats in Cuba began experiencing hearing loss, dizziness and memory problems -- in what the Trump administration attributed to an attack of unknown origin. Now researchers say they have detected some "alterations" in the patients' brain structure and function -- though the significance, if any, is disputed. The findings come from 40 U.S. embassy employees who, between 2016 and 2018, reported symptoms of what came to be known in the media as "Havana syndrome." They suffered from a range of concussion-like symptoms, including balance problems, memory lapses, difficulty concentrating, insomnia, headaches and nausea. In 2017, the State Department said the employees may have been victims of a "sonic attack" that...