- Correspondence to Dr Xin Li, Department of Neurology, The Second Hospital of Tianjin Medical University, Tianjin 300211, China; ; Dr Sean X Leng, Division of Geriatric Medicine and Gerontology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA;
- Received November 4, 2019
- Revised July 7, 2020
- Accepted August 2, 2020
- First published August 27, 2020.
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