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Table 2 Search strategy for retrieval of relevant articles from multiple databases

From: Sex differences in outcomes of methadone maintenance treatment for opioid addiction: a systematic review protocol

Database Search strategy
MEDLINE n = 401 1. Opioid-related disorders/dt, rh, th [Drug Therapy, Rehabilitation, Therapy]
  2. Opiate substitution treatment/
3. Methadone/
4. Sex Characteristics/
5. sex differences.m_titl.
6. gender differences.m_titl.
7. sex.m_titl.
8. male.m_titl.
9. female.m_titl.
10. men.m_titl.
11. women.m_titl.
12. 1 or 2 or 3
13. 4 or 5 or 6 or 7 or 8 or 9 or 10 or 11
14. 12 and 13
15. limit 14 to humans
EMBASE n = 180 1. Opioid-related disorders/dt, rh, th [Drug Therapy, Rehabilitation, Therapy]
  2. Opiate substitution treatment/
3. Methadone/
4. Sex Characteristics/
5. sex differences.m_titl.
6. gender differences.m_titl.
7. sex.m_titl.
8. male.m_titl.
9. female.m_titl.
10. men.m_titl.
11. women.m_titl.
12. 1 or 2 or 3
13. 4 or 5 or 6 or 7 or 8 or 9 or 10 or 11
14. 12 and 13
15. limit 14 to humans
PsycINFO n = 241 1. exp Methadone Maintenance/ or exp Methadone/
  2. exp Human Sex Differences/
3. sex.m_titl.
4. male.m_titl.
5. female.m_titl.
6. men.m_titl.
7. women.m_titl.
8. 2 or 3 or 4 or 5 or 6 or 7
9. 1 and 8
10. limit 9 to humans
CINAHL n = 23 1. Opioid abuse (TX All Text)
  2. Methadone (TX All Text)
3. Methadone treatment programs (MJ Word in Major Subject Heading)
4. Gender differences (TX All Text)
5. Sex differences
6. 1 or 2 or 3 and 4 or 5
7. limit 6 to human