L. S. Eberlin, J. V. Mulcahy, A Tzabazis, J. Zhang, H. Liu, M. M. Logan, H. J. Roberts, G. K. Lee, D. C. Yeomans, J. Du Bois and R. N. Zare,”Visualizing Dermal Permeation of Sodium Channel Modulators by Mass Spectrometric Imaging,” J. Am. Chem. Soc. 136,6401-6405 (2014).