Hoffman, Kim A., et al. “Barriers to Implementing Screening, Brief Intervention and Referral to Treatment for Substance Use in HIV-AIDS Health Services in Peru”. Revista Peruana De Medicina Experimental Y Salud Pública, vol. 33, no. 3, July 2016, pp. 432-7, https://doi.org/10.17843/rpmesp.2016.333.2293.