Long, Miaomiao http://orcid.org/0000-0002-1064-8922
Wang, Ling
Tian, Qin
Ding, Hao
Qin, Wen
Shi, Dapeng
Yu, Chunshui
Article History
Received: 3 January 2019
Revised: 13 March 2019
Accepted: 15 March 2019
First Online: 25 March 2019
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest.
: This research has been approved by the Ethics Committees of Tianjin Medical University General Hospital, Tianjin First Central Hospital, Zhengzhou University People's Hospital and Henan Provincial People's Hospital, and it has been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments.
: Informed consents from all subjects or their parents (for children less than 18 years old) were obtained before the study.