Heidi Wyandt, 27, holds a handful of her medication bottles at the Altoona Center for Clinical Research in Altoona, Pa., on Wednesday, March 29, 2017, where she is helping test an experimental non-opioid pain medication for chronic back pain related to a work related injury she received in 2014. With about 2 million Americans hooked on opioid painkillers, researchers and drug companies are searching for less addictive drugs to treat pain. (AP Photo/Chris Post)

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