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. 2018 Oct 26;12:69. doi: 10.3389/fnbot.2018.00069

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Copyright © 2018 Hong and Zafar.

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) and the copyright owner(s) 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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Subjects and brain areas used in initial dip studies: (A) human vs. animal (cat, rat, and monkey) subjects, (B) brain areas. The charts were constructed using 103 articles (1990–2018) from Web of Science (www.isiknowledge.com).