Rüütel, Kristi, Anda Karnite, Ave Talu, Katri Abel-Ollo, Gunta Kirvelaite, Kai Kliiman, Helle-Mai Loit, and Anneli Uusküla. "Prevalence of IGRA-positivity and risk factors for tuberculosis among injecting drug users in Estonia and Latvia." The International journal on drug policy (2013).