Typographical error: all "Pn" should be "pn" Ray-Guang Cheng, National Taiwan University of Science and Technology 3 March 2015 There is a small typographical error that can be confusing in the text. For consistency, all Pn (written with capital "P") should be pn (written with small "p"). Thank you Competing interests I declare that I have no competing interest.
Typographical error: all "Pn" should be "pn"
3 March 2015
There is a small typographical error that can be confusing in the text. For consistency, all Pn (written with capital "P") should be pn (written with small "p").
Thank you
Competing interests
I declare that I have no competing interest.