proven tools http://www.who.int/hiv/topics/idu/en/ tego adresu World Health Organization http://www.who.int/hiv/topics/idu/en/ WHO, 2013 World Health Organization WHO Harm Reduction in relation to drug use only condone, even promote drug use WHO World Health Organization Injecting drug use and prisons World Health Organization 13 million people ইনজেকটিং ড্রাগ ইউজারদের WHO WHO: HIV - People who inject drugs