In this Oct. 3, 2017, file photo, tourists ride classic convertible cars on the Malecon beside the United States Embassy in Havana, Cuba. Doctors treating the U.S. Embassy victims of mysterious, invisible attacks in Cuba have discovered brain abnormalities as they search for clues to hearing, vision, balance and memory damage, The Associated Press has learned. (AP Photo/Desmond Boylan) ** FILE **
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