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Kim SH, Jeon SH, Cho JL, Chong HT, Kim DJ, Kim MC, Eun JP.Kim SH, et al. Among authors: chong ht.Eur Spine J. 2012 Jun;21 Suppl 4(Suppl 4):S450-2. doi: 10.1007/s00586-011-2071-4. Epub 2012 Jan 17.Eur Spine J. 2012.PMID: 22249307Free PMC article.