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. 2015 Jun 17;10(6):e0129210. doi: 10.1371/journal.pone.0129210

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© 2015 Fokam 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 properly credited.

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Fig 3 — NV, Not Validated; green, desirable performance; red, poor performance. The horizontal line in “green” color indicates the lower limit threshold for a “desirable” performance.