Gu, Juan
Dong, Dandan
Long, Enwu
Tang, Shiwei
Feng, Suqin
Li, Tingting
Wang, Ling
Jiang, Xuehua
Article History
Accepted: 13 September 2019
First Online: 16 November 2019
Compliance with ethical standards
:
: This study was approved by the ethics committees at Sichuan academy of medical Sciences & Sichuan Provincial People’s Hospital in China. Written informed consent was not obtained from the patients or their relatives due to the retrospective study design of using the electronic health records and no additional interventions were given to the subjects.
: The authors have no competing interests to declare.