Min Chen ⁎, 1
These authors contributed equally to this work.

Health Laboratory Center, Yunnan Center for Disease Control and Prevention, Kunming, Yunnan, China
⁎Correspondence to: Yunnan Center for Disease Control and Prevention, No 158, Dongsi Street, Xishan District, Kunming, Yunnan 650022, China.Yunnan Center for Disease Control and PreventionNo 158, Dongsi Street, Xishan DistrictKunmingYunnan650022China
Yanling Ma 2
These authors contributed equally to this work.
, Huichao Chen
Institute for AIDS/STD Control and Prevention, Yunnan Center for Disease Control and Prevention, Kunming, Yunnan, China
Shouxiong Lei
Division for AIDS/STD Control and Prevention, Zhaotong Center for Disease Control and Prevention, Zhaotong, Yunnan, China
Manhong Jia ⁎ 
Institute for AIDS/STD Control and Prevention, Yunnan Center for Disease Control and Prevention, Kunming, Yunnan, China
∗Correspondence to: Yunnan Center for Disease Control and Prevention, No 158, Dongsi Street, Xishan District, Kunming, Yunnan 650022, China.Yunnan Center for Disease Control and PreventionNo 158, Dongsi Street, Xishan DistrictKunmingYunnan650022China
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