Text and Data Mining valid from 2020-01-10
Received: 17 September 2019
Accepted: 16 December 2019
First Online: 10 January 2020
Ethics approval and consent to participate
: The study protocol was approved by the Ethics Committee of Peking Union Medical College Hospital. All the enrolled patients consented to attend this cohort study and signed written consent.
: We obtained consent for publication from all the individuals whose detailed information was included in this manuscript.
: The authors declare that they have no competing interests.