Cornish, R; Macleod, J; Strang, J; Vickerman, P; Hickman, M; (2010) Risk of death during and after opiate substitution treatment in primary care: prospective observational study in UK General Practice Research Database. BMJ (Clinical research ed), 341. c5475. ISSN 0959-8138 DOI: https://doi.org/10.1136/bmj.c5475