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. 2020 Jun 2;11:420. doi: 10.3389/fneur.2020.00420

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Copyright © 2020 Zhao, He, He, Zhou, Pan, Zhou, Zhu, Zhou, Liu, Xu, Sun, Tan, Yan, Tang and Guo.

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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Receiver operating characteristic (ROC) curves. (A) Relating sensitivity and specificity for olfactory threshold, discrimination, and identification (TDI) and I scores in differentiating Parkinson's disease (PD) patients from healthy controls. (B) Relating sensitivity and specificity for olfactory TDI and I scores combining Mini-Mental State Examination (MMSE) and Non-Motor Symptom Scale (NMSS) in differentiating PD patients from healthy controls.