Text and Data Mining valid from 2019-04-15
Received: 13 November 2018
Accepted: 15 March 2019
First Online: 15 April 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This study has been approved by the Ethics Committee of the West China Hospital, Sichuan University.
: Informed consent was obtained from all individual participants included in the study.