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Bloodied white mesh covers the head of a methamphetamine user named Yan on Monday, Oct. 29, 2018, three days after he had a deep brain stimulation device implanted as part of a clinical trial at Ruijin Hospital in Shanghai, China. The hope is that DBS will extinguish his addiction, quite literally, with the flip of a switch. Critics say such human experiments are premature and risky, but U.S. regulators in February greenlighted a human trial of DBS for opioid addiction at West Virginia University. (AP Photo/Erika Kinetz)

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