By Janee. Brody
There is one undeniable fact about chronic pain: More often than not, it is untreated or under-treated. In a survey last year by the American Pain Society, only 55 percent of all patients with noncancer-related pain and fewer than 40 percent with severe pain said their pain was under control.

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As bicycle attendant Guo Guiyou stands guard outside a busy Beijing railway station, he suddenly makes a loud coarse noise as he opens his mouth and propels a gobbet of spit on to the pavement.

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