Funding for this research was provided by:
Innovation group project of AIDS research in Yunnan province (2014HC019)
Doctoral innovation and science foundation of Kunming Medical University (2017B001)
Received: 17 November 2017
Accepted: 10 January 2019
First Online: 17 January 2019
Ethics approval and consent to participate
: Because the study was based on aggregate data, ethical approval was not required. All data used in this study were obtained through approvals from Yunnan AIDS Prevention Bureau.
: Not applicable.
: The authors declared that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.