Globus pallidus internus deep brain stimulation improves axial symptoms of Parkinson patients after long-term subthalamic nucleus stimulation: A case series study by Chencheng Zhang, MD, Yixin Pan, MD, Linbin Wang, MSc, Tao Wang, MD, Jing Zhang, MD, Haiyan Zhou, MD, Wei Hu, MD, PhD, Bomin Sun, MD, Adolfo Ramirez-Zamora, MD, Dianyou Li, MD, PhD

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