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. 2018 May 11;9:334. doi: 10.3389/fneur.2018.00334

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Copyright © 2018 Guo, Guan, Zeng, Xuan, Gu, Huang, Xu and Zhang.

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 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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Small-worldness of normal controls (NCs), Parkinson’s disease (PD) patients with possible rapid eye movement sleep behavior disorder (RBD) (PD-pRBD), and PD patients with non-possible RBD (PD-npRBD). The graphs show the changes in Lambda, Gamma, and Sigma as a function of density thresholds. At a wide range of density, the network of each group have an average Gamma of greater than 1, an average Lambda of nearly 1, and Sigma greater than 1, which indicates prominent small-world properties.