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. 2012 Sep 27;7(9):e45444. doi: 10.1371/journal.pone.0045444

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© 2012 Hu 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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The icons are borrowed from the electrical circuit [30]. (A) A vessel is in series with a fixed resistance . (B) The parallel part of two vessels is in series with a fix resistance. (C) The parallel part is controlled by the open-close switches.

Inline graphic — The icons are borrowed from the electrical circuit [30]. (A) A vessel is in series with a fixed resistance . (B) The parallel part of two vessels is in series with a fix resistance. (C) The parallel part is controlled by the open-close switches.