Comprehensive analysis of endoscopic ultrasound (EUS) in mediastinal lesions: patient characteristics, diagnostic outcomes, safety, and efficacy: a multi-country study by Hussein Okasha, Eyad Gadour, Ghias Un Nabi Tayyab, Andrada Seicean, Elbacha Hicham, Emad Emad, Turki Alamri, Nadeem Tehami, Heero Ismael Faraj, Ahmed Alzamzamy, Hiwa Hussein, Mohammed Tag-Adeen, Mohamed Elbasiony, Abed Al-Lehibi, Shereen Saleh, Zaher Houmani, Mohamed Abdelghani, Khaled Ragab, Zahi Ismaili, Othmane Drir, Elsayed Ghoneem, Omar Abdallah, Souad Rebiai, Nonthalee Pausawasdi, Fedoua Rouibaa, Mohamed Borahma, Hassan Atalla, Mahmoud Farouk, Ahmed Altonbary