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. 2018 Jul 25;13(7):e0201260. doi: 10.1371/journal.pone.0201260

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© 2018 Ohmichi et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 1 — Fig 1(A) Scatter plot showing the levels of serum theophylline in the control (n = 33) and PD (n = 31) groups. Bars indicate median values. The levels of theophylline in the PD group were significantly lower than those in the control group (P = 0.0383). Fig 1(B) ROC curve showing serum levels of theophylline to discriminate PD patients from controls. The AUC value was 0.65.