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APA Citation
Sordo, L., Barrio, G., Bravo, M. J., Indave, B. I., Degenhardt, L., Wiessing, L., Ferri, M., & Pastor-Barriuso, R. (2017). mortality risk during and after opioid substitution treatment: systematic review and meta-analysis of cohort studies. BMJ, 357, . http://access.bl.uk/ark:/81055/vdc_100144727295.0x00001c