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Retraction Note to four articles published in World Journal of Orthopaedics:(1)Iwamoto J,Sato Y,Takeda T,Matsumoto H.Return to sports activity by athletes after treatment of spondylolysis.World J Orthop 2010;1(1):26-30 PMID:22474624 DOI:10.5312/wjo.v1.i1.