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| Methods | Randomized parallel‐group design |
| Participants |
Inclusion criteria: 39 adults with lacrimal duct obstruction Exclusion criteria: not reported |
| Interventions |
Intervention: drainage tube implantation combined with mitomycin C treatment Comparison intervention: drainage tube implantation alone |
| Outcomes |
Primary outcome: anatomical patency Secondary outcome: not reported |
| Notes |
DCR: dacryocystorhinostomy NLDO: nasolacrimal duct obstruction
