%0 Journal Article %T Issues and Applications in Label-Free Quantitative Mass Spectrometry %A Xianyin Lai %A Lianshui Wang %A Frank A. Witzmann %J International Journal of Proteomics %D 2013 %I Hindawi Publishing Corporation %R 10.1155/2013/756039 %U http://dx.doi.org/10.1155/2013/756039