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History
- Accepted June 22, 2021
- Published online July 13, 2021.
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© American Federation for Medical Research 2021. Re-use permitted under CC BY-NC. No commercial re-use. Published by BMJ. http://creativecommons.org/licenses/by-nc/4.0/This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, an indication of whether changes were made, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.
Author Information
- 1Child Care Center, Fujian Provincial Maternity and Children's Hospital, Fuzhou, China
- 2Department of Pediatrics, Weifang Medical School, Weifang, China
- 3Department of Pediatrics, Shandong University Qilu Hospital, Jinan, Shandong, China
- Correspondence to Dr Ai hua Cao, Department of Pediatrics, Shandong University Qilu Hospital, Jinan, Shandong, China; xinercah{at}163.com