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Back pain among farmers in a northern area of China.
Liu X, Wang L, Stallones L, Wheeler KK, Zhao W, Smith GA, Xiang H. Liu X, et al. Spine (Phila Pa 1976). 2012 Mar 15;37(6):508-14. doi: 10.1097/BRS.0b013e318221e83f. Spine (Phila Pa 1976). 2012. PMID: 21587102 Free PMC article.