[1] [1] D. A. Boas, C. Pitris, and N. Ramanujam, Handbook of Biomedical Optics (CRC Press, Boca Raton, 2011) pp. 359-373.

[2] [2] T. J. Muldoon, S. A. Burgess, B. R. Chen, D. Ratner, and E. M. Hillman, Biomed. Opt. Express 3, 1701 (2012).

[3] [3] E. M. Hillman, and S. A. Burgess, Laser Photon. Rev. 3, 159 (2009).

[4] [4] L. V. Wang and H. I. Wu, Biomedical Optics: Principles and Imaging (Wiley, New York, 2007).

[5] [5] D. Wang, J. Zhang, Y. Zhao, S. Chen, L. Yuan, J. Lei, C. Zhang, and S. Hou, Chin. Opt. Lett. 10, 122301 (2012).

[6] [6] W. Cai and L. Ma, Chin. Opt. Lett. 10, 012901 (2012).

[7] [7] Q. Liu and N. Ramanujam, J. Opt. Soc. Am. A 24, 1011 (2007).

[8] [8] V. V. Tuchin, Tissue Optics: Light Scattering Methods and Instruments for Medical Diagnosis (SPIE Press, Bellingham, 2007).

[9] [9] T. J. Pfefer, L. S. Matchette, C. L. Bennett, J. A.Gall, J. N. Wilke, A. J. Durkin, and M. N. Ediger, J. Biomed. Opt. 8, 206 (2003).

[10] [10] H. Zhao, X. Zhou, J. Liang, and S. Zhang, Chin. Opt. Lett. 6, 935 (2008).

[11] [11] C. K. Hayakawa, J. Spanier, F. Bevilacqua, A. K. Dunn, J. S. You, B. J. Tromberg, and V. Venugopalan, Opt. Lett. 26, 1335 (2001).

[12] [12] A. Dunn and D.Boas, Opt. Lett. 25, 1777 (2000).

[13] [13] H. Liu, D. A. Boas, Y. Zhang, A. G. Yodh, and B. Chance, Phys. Med. Biol. 40, 1983 (1995).

[14] [14] C. Zhu and Q. Liu, J. Biomed. Opt. 17, 0105011 (2012).

[15] [15] X. Zhou, Y. Fan, Q. Hou, H. Zhao, and F. Gao, Appl. Opt. 52, 1779 (2012).

[16] [16] Z. Lingling, W. Huaxiang, X. Yanbin, and W. Da, WSEAS Transactions on Circuits and Systems 10, 393 (2011).

[17] [17] F. Yang, F. Gao, P. Ruan, and H. Zhao, Appl. Opt. 49, 3111 (2010).