`Social evils` and harm reduction: the evolving policy environment for human immunodeficiency virus prevention among injection drug users in China and Vietnam

Theodore M. Hammett, Zunyou Wu, Tran Tien Duc, David Stephens, Sheena Sullivan, Wei Liu, Yi Chen, Doan Ngu and Don C. Des Jarlais

Addiction 103 ( 1 ): 137 - 145 , 2008