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Vanderploeg RD, Collins RC, Sigford B, Date E, Schwab K, Warden D; Defense and Veterans Brain Injury Center Veterans Health Administration study planning group.Vanderploeg RD, et al. Among authors: sigford b.J Head Trauma Rehabil. 2006 Mar-Apr;21(2):179-93. doi: 10.1097/00001199-200603000-00010.J Head Trauma Rehabil. 2006.PMID: 16569991