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. Author manuscript; available in PMC: 2013 May 14.
Published in final edited form as: Conf Proc IEEE Eng Med Biol Soc. 2009;2009:10.1109/IEMBS.2009.5332437. doi: 10.1109/IEMBS.2009.5332437

Fig. 1.

Fig. 1

Four different expressions of a subject. The 2 left images correspond to non-pain, whereas the 2 right images correspond to pain.