Data items
| Data items | Description |
| Reference ID number | ID number in citation management software. |
| Author (s) | First author. |
| Year of publication | Article year. |
| Geographic location | In which country/city was the study conducted (including context). |
| Study design | The study design as defined by authors. |
| Study setting | Where did the study take place (including context). |
| Population and sample size | Number and characteristics of participants of the study. |
| Study aims/purpose | The aims of the study as defined by the author. |
| Intervention description | Characteristics of the buprenorphine intervention described by the author (may include no direct intervention in the study, eg, survey of attitudes). |
| Outcomes | How the authors measured outcomes and the main results. |
| Barriers to the intervention at different levels | Factors that may have reduced use of buprenorphine at the level of the patient, healthcare professional, organisation and healthcare system level. |
| Facilitators to the intervention at different levels | Factors that may have enabled use of buprenorphine at the level of the patient, healthcare professional, organisation and healthcare systems. |
| Theoretical basis | If applicable, theories and frameworks described in the study for the categorisation of barriers and facilitators. |
| Study limitations | Authors’ reported gaps and limitations of the study. |