SEOUL, South Korea — Defectors who lived near North Korea’s nuclear testing site say they believe they are suffering from exposure to radiation and fear for the health of family members still living there.

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Standing about 5 feet tall, Lee Jeong Hwa walks with a slight limp. Middle-aged with an ashen gray complexion and deep-set dark brown eyes, Lee says she's in constant pain.

But back home, things are much worse, she says.

"So many people died we began calling it 'ghost disease,'" she said. "We thought we were dying because we were poor and we ate badly. Now we know it was the radiation."

As Lee rubs her sore right leg in the office of SAND, a nongovernmental organization in Seoul that advocates human rights in North Korea, she recounted how she was caught trying to flee the country in 2003.