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          - Dariusz Czaprowski and Tomasz Kotwicki.
- Faculty of Physiotherapy, Józef Rusiecki University College in Olsztyn, Bydgoska 33, 10-243, Olsztyn, Poland, dariusz.czaprowski@interia.pl.
- Eur Spine J. 2012 Jan 31; 21 (6): 121612171216-7.
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