- Correspondence to Mrs Katie R Mollan, Center for AIDS Research, School of Medicine, University of North Carolina, Chapel Hill, CH, USA; , Dr Weiming Tang, University of North Carolina Project-ChinaGuangzhouChina; and Professor Li Ling, Faculty of Medical Statistics and Epidemiology, School of Public HealthSun Yat-sen UniversityGuangzhouChina;
- Received 14 September 2017
- Revised 9 November 2017
- Accepted 13 November 2017
- Published online 28 November 2017.
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