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Soon EL, Leong AZ, Chiew J, Kaliya-Perumal AK, Yu CS, Oh JY.Soon EL, et al.Asian Spine J. 2019 Mar 15;13(4):563-568. doi: 10.31616/asj.2018.0231. Print 2019 Aug.Asian Spine J. 2019.PMID: 30866619Free PMC article.