Table 1.

Keywords for search strategy

Search block	Example keywords (1)
1: Opiods	opioid, opiate, heroin, diacetylmorphine, diamorphine, hydromorphone
2: Addiction	addiction, dependence, disorder, use, misuse, abuse, OUD
3: Intravenous use	inject, injecting, injectable, intravenous, parenteral
4: Treatment	substitution, maintenance, agonist, heroin-assisted, OAT, OST, OMT, program
5: Feasibility aspects	feasibility, acceptability, demand, implementation, practicality, barriers, facilitators
6	1 AND 2 AND 3 AND 4 AND 5

(1) For detailed search strategies including all keywords and controlled vocabulary, see supplementary material