Long-Term Outcomes of External Dacryocysto-rhinostomy with U-Flap and Nasolacrimal Intubation in Adult Patients with Small Lacrimal Sac and Primary Nasolacrimal Duct Obstruction. - Singh A; Choudhary A; Mishra S; Ansari A; Mallik BK; Kumar B (Ceska a slovenska oftalmologie : casopis Ceske oftalmologicke spolecnosti a Slovenske oftalmologicke spolecnosti, 2026)