Funding for this research was provided by:
National Natural Science Foundation of China (81771825, 81720108022, 91649116, 81571040)
Ministry of Science and Technology of the People's Republic of China (2017YFC1307904)
Received: 6 December 2018
Accepted: 30 May 2019
First Online: 1 July 2019
Ethics approval and consent to participate
: The study protocol was approved by the Ethics Committee of the Second Affiliated Hospital of Tsinghua University and other local Ethics Committee at each participating hospital and all patients provided written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.