- Correspondence to Professor Meina Liu, Department of Biostatistics, Harbin Medical University, Harbin, Heilongjiang, China; ; Dr Qiuju Zhang, Department of Biostatistics, Harbin Medical University, Harbin, Heilongjiang, China;
- Received July 23, 2019
- Revised June 6, 2020
- Accepted June 24, 2020
- First published July 15, 2020.
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