Antibiotic prophylaxis in emergency cholecystectomy for mild to moderate acute cholecystitis: a systematic review and meta-analysis of randomized controlled trials oleh Mohamed Hamouda Elkasaby, Hesham Elsayed, Dilawer Chofan Charo, Mohamed Abdalla Rashed, Omar Elkoumi, Islam Mohsen Elhaddad, Ahmed Gadallah, Alaa Ramadan