Comparative evaluation of posterior flap management techniques in external dacryocystorhinostomy: clinical and endoscopic study. - Maaboud, Mohamed Sayed Abdel; Eid, Ahmed Mostafa; Othman, Mohamed Farouk Sayed; Khalil, Mohamed Farag; Khaleel, Ahmed Ibrahim; Khalil Esmail, Mohamed Esmail; Mahmoud, Mohamed Salah El-Din (Journal of the Egyptian Ophthalmological Society, 2025)