| Classifying opioid addictive substances according to ICD-10 | 35 (37.6) | 10 (10.8) | 48 (51.6) |
| Withdrawal syndrome and opioid poisoning | 28 (30.1) | 15 (16.1) | 50 (53.8) |
| Initial screening, examination and initial dosage of methadone | 24 (25.8) | 22 (23.7) | 47 (50.5) |
| Methadone treatment at first stage to detect suitable dose | 33 (35.5) | 18 (19.3) | 42 (45.2) |
| Methadone treatment at maintain stage | 34 (36.6) | 13 (14.0) | 46 (49.5) |
| Reducing methadone dose, stopping treatment and restarting treatment | 29 (31.2) | 15 (16.1) | 49 (52.7) |
| Management of adverse events on methadone treatment | 34 (36.6) | 18 (19.3) | 41 (44.1) |
| Management of special issues in methadone treatment | 30 (32.3) | 18 (19.3) | 45 (48.4) |
| Management of drug interactions on methadone treatment | 31 (33.3) | 18 (19.4) | 44 (47.3) |
| Methadone treatment for special populations and patients with co-morbidities | 33 (35.5) | 14 (15.0) | 46 (49.5) |