- Correspondence to Professor Qiang Feng, Department of Human Microbiome, JinanSchool and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University & Shandong Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan, Shandong, China; ; Professor Yinghui Li, State Key Laboratory of Space Medicine Fundamentals and Application, China Astronaut Research and Training Center, Beijing, China;
- Received February 25, 2020
- Revised August 5, 2020
- Accepted August 9, 2020
- First published September 10, 2020.
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