Received: 15 January 2020
Accepted: 9 June 2020
First Online: 15 June 2020
Ethics approval and consent to participate
: The experimental protocol was established, according to the ethical guidelines of the Helsinki Declaration and was approved by the “Human Ethics Committee of Beijing 302 hospital”.Written informed consents were obtained from all of these individuals or guardian participants. The consent obtained from guardians was in writing and on behalf of any patients that were minors at the time of study.
: The authors, WHZ, PPD, LL, YLW, WHL, JJH, JH and HWL have no conflicts of interest or financial ties to disclose.