Chinese President Xi Jinping's wife Peng Liyuan, who is the World Health Organization (WHO)'s goodwill ambassador for tuberculosis and HIV/AIDS, signs ona banner while attending a publicizing activity for the prevention and cure of tuberculosis and HIV/AIDS in Hainan University in Haikou, capital of south China's Hainan Province, March 29, 2015.(Xinhua/Lan Hongguang) |