1. Sino-French Collaboration Center for AIDS Research, Chinese Academy of Medical Sciences and Peking Union Medical College, Tsinghua University, Beijing, People's Republic of China.
2. UMR145, Institut de Recherche pour le Développement and University of Montpellier 1, Montpellier, France.
3. Xishuangbanna Center for Disease Control and Prevention, Jinghong, Yunnan, People's Republic of China.
4. Institute of Tropical Medicine, Guangzhou, Guangdong, People's Republic of China.
5. Institut de Recherche sur les Vaccins et l'Immunothérapie des Cancers et du SIDA at the Centre Biomédical des Saints-Pères, Université Paris Descartes, Paris, France.