RT Journal Article SR Electronic T1 Unusual increase in reported HIV/AIDS cases among older persons in western Hunan province, China JF Sexually Transmitted Infections JO Sex Transm Infect FD BMJ Publishing Group Ltd SP 538 OP 538 DO 10.1136/sextrans-2011-050228 VO 87 IS 6 A1 Xi Chen A1 Jun Zheng A1 Jian Mei He A1 BiYun Qin A1 Yifei Hu A1 Lu Wang A1 Ning Wang YR 2011 UL http://sti.bmj.com/content/87/6/538.1.abstract AB