Received: 11 November 2020
Accepted: 23 March 2021
First Online: 15 April 2021
: This study was approved by the Ethics Committees of the Institute of Hematology, CAMS and PUMC (Ethics number: KT2017031-EC-1). Written informed consent to participate was obtained from all of the participants in the study. Written informed consent to participate was obtained from the parents of the patients under the age of 18.
: Written informed consents for publication of clinical details and images were obtained from participant and the parents of the participants under the age of 18.
: All methods used during the current study were carried out in accordance with relevant guidelines and regulations.
: The authors declare that they have no competing interests.