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. 2017 Mar 27;11:147. doi: 10.3389/fnhum.2017.00147

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Copyright © 2017 Ikeda, Nozawa, Yokoyama, Miyazaki, Sasaki, Sakaki and Kawashima.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Ultra-small near infrared spectroscopy (NIRS). (A) Installation of an ultra-small NIRS. (B) The distance between the emitter and two detectors (1 and 3 cm, respectively).