- Correspondence to Dr Henry Xiang, Center for Injury Research and Policy and Center for Pediatric Trauma Research, Abigail Wexner Research Institute at Nationwide Children's Hospital, Columbus, OH 43205, USA;
- Received March 6, 2019
- Revised June 19, 2019
- Accepted June 20, 2019
- First published July 12, 2019.
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