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[1] A. Maki, et al., Med Phys., 22, 1997(1995).

[2] ¾®Àô±ÑÌÀ¡¡Â¾, ·×¬¤ÈÀ©¸æ¡¤421, 402(2003).

[3] M. Pena, et al., Proc. Natl. Acad. USA, 100, 11702 (2003).

[4] H. Tachibana et al., Proc. of The Second Asian and Pacific Run Symposium On Biophotonics, (2004).

[5] K. Masumoto, et al., JCBFM 23, 1075 (2003).