- Correspondence to Ms Sui Zhu, Department of Medical Statistics, School of Medicine, Jinan University, Guangzhou 510632, Guangdong, China; ; Professor Sui-Fang Lin, Department of Child Health, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, China;
- Received August 30, 2020
- Revised December 2, 2020
- Accepted December 3, 2020
- First published December 22, 2020.
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