Wang Guan, Wang Yang, Niu Wenquan
Department of Anatomy, Qiqihar Medical University, Qiqihar, Heilongjiang, China.
Department of Medical Service Supervision, Qiqihar Health Inspection Bureau, Qiqihar, Heilongjiang, China.
JAMA Pediatr. 2020 May 1;174(5):504-505. doi: 10.1001/jamapediatrics.2019.6080.