This image provided by the American Medical Association in July 2019 shows the amount of differences between brain scans of patients, U.S. diplomats who developed concussion-like symptoms after working in Cuba, and a control group. Between late 2016 and May 2018, several U.S. and Canadian diplomats in Havana complained of health problems from an unknown cause. One U.S. government count put the number of American personnel affected at 26. (American Medical Association via AP)
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