Funding for this research was provided by:
Beijing Municipal Administration of Hospitals’ Youth Programme (QML20170307)
Text and Data Mining valid from 2019-04-16
Received: 4 November 2018
Accepted: 20 March 2019
First Online: 16 April 2019
Compliance with ethical standards
: YH, CQ, PW, FZ, GW, ZG, GG, and JY declare that they have no conflict of interests.
: This study was approved by Institutional Review Board approval and the study including human participants had been performed in accordance with the ethical standards of the Declaration of Helsinki and its later amendments.
: This article does not contain any studies with animals by any of the authors.
: Informed consents were obtained from all patients’ parents or guardians.