- Correspondence to Dr Joseph Jankovic, Department of Neurology, Parkinson's Disease Center and Movement Disorders Clinic, Baylor College of Medicine, 6550 Fannin, Suite 1801, Houston, TX 77030, USA;
- Received July 31, 2014
- Revised October 8, 2014
- Accepted October 28, 2014
- First published November 19, 2014.
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