Funding for this research was provided by:
Project of Education Department in Sichuan (18ZB0633)
Natural Science Foundation of Southwest Medical University (2017-ZRZD-022, 2018-ZRZD-011)
National Undergraduate Innovation and Entrepreneurship Project (201816032021)
Received: 8 May 2019
Accepted: 12 August 2019
First Online: 19 August 2019
Ethics approval and consent to participate
: The current study was approved by the Ethics Committee of Southwest Medical University (No.201903–194) and were carried out in accordance with the approved guidelines. Written informed consent was exempted, since this retrospective study mainly focused on bacteria and patient intervention was not required.
: Not applicable.
: The authors declare that they have no competing interests.