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Viru A, Viru M.Viru A, et al.J Strength Cond Res. 2005 Feb;19(1):6-8. doi: 10.1519/1533-4287(2005)19<6:POTPIP>2.0.CO;2.J Strength Cond Res. 2005.PMID: 15705047Review.No abstract available.