Mark Lenzi, a U.S. State Department security engineer who was among several diplomats evacuated in 2018 from the U.S. Consulate in Guangzhou, China, speaks at a news conference Friday, May 10, 2019, in Boston. Lenzi suffered headaches and memory loss under mysterious circumstances while stationed in China. He has pledged to donate his brain for research. (AP Photo/Rodrique Ngowi)
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