Concomitant use of benzodiazepine and alcohol in methadone-maintained patients from the ANRS–Methaville trial: Preventing the risk of opioid overdose in patients who failed with buprenorphine … Continued here: Concomitant use of benzodiazepine and alcohol in methadone-maintained patients from the ANRS–Methaville trial: Preventing the risk of opioid overdose in patients who failed with buprenorphine