There is an error in Equation S5b, which is listed under "Appendix S1". Please view the correct Equation S5b here: http://www.plosone.org/corrections/pone.0080279.001.cn.tif
Footnotes
Competing Interests: No competing interests declared.
There is an error in Equation S5b, which is listed under "Appendix S1". Please view the correct Equation S5b here: http://www.plosone.org/corrections/pone.0080279.001.cn.tif
Competing Interests: No competing interests declared.