Funding for this research was provided by:
National Natural Science Foundation of China (81472817)
Received: 16 October 2018
Accepted: 30 January 2019
First Online: 4 March 2019
Ethics approval and consent to participate
: The study was approved by the Beijing Tsinghua Changgung Hospital review board.
: All patients have consent for publication.
: The authors declare that they have no competing interests.