“…Improvement of the very poor mental health status among PWID has important public health implications such as adherence to methadone treatment (Gu et al, 2014c), acts of risk behaviors (Crooks et al, 2015;German and Latkin, 2012;Gu et al, 2010;Reyes et al, 2007), and HIV prevention (Conner et al, 2008;Crooks et al, 2015;Stein et al, 2003). It is also well documented that mental health problems affect other aspects of health and social well-being, such as physical health (Kolappa et al, 2013), suicidal ideation (Armstrong et al, 2014;Jin et al, 2013), and social support. The Chinese government needs to provide integrated services and support to PWID, covering their psychosocial needs.…”