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6. © 2009 Jiang and Yu; licensee BioMed Central Ltd. This is an Open Access ar-
ticle distributed under the terms of the Creative Commons Attribution License
(http://creativecommons.org/licenses/by/2.0), which permits unrestricted use,
distribution, and reproduction in any medium, provided the original work is
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7. © 2008 FitzGerald et al. This is an open-access article distributed under the
terms of the Creative Commons Attribution License, which permits unrestrict-
ed use, distribution, and reproduction in any medium, provided the original
author and source are credited.
8. © 2009 Cheng et al. This is an open-access article distributed under the terms
of the Creative Commons Attribution License, which permits unrestricted use,
distribution, and reproduction in any medium, provided the original author
and source are credited.
9. © 2009 Song et al.; licensee BioMed Central Ltd. This is an Open Access ar-
ticle distributed under the terms of the Creative Commons Attribution License
(http://creativecommons.org/licenses/by/2.0), which permits unrestricted use,
distribution, and reproduction in any medium, provided the original work is
properly cited.
10. © 2009 Sannier et al.; licensee BioMed Central Ltd. This is an Open Access ar-
ticle distributed under the terms of the Creative Commons Attribution License
(http://creativecommons.org/licenses/by/2.0), which permits unrestricted use,
distribution, and reproduction in any medium, provided the original work is
properly cited.
11. © 2005 Snell and Aarssen; licensee BioMed Central Ltd. This is an Open Access
article distributed under the terms of the Creative Commons Attribution Li-
cense (http://creativecommons.org/licenses/by/2.0), which permits unrestricted
use, distribution, and reproduction in any medium, provided the original work
is properly cited.
12. © 2006 Fontaine et al. This is an open-access article distributed under the terms
of the Creative Commons Attribution License, which permits unrestricted use,
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and source are credited.
13. © 2009 Waelti et al.; licensee BioMed Central Ltd. This is an Open Access ar-
ticle distributed under the terms of the Creative Commons Attribution License
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