RETRACTED: Two-day seven-day course of levofloxacin in acute COPD exacerbation: a randomized controlled trial - Salma Messous; Imen Trabelsi; Khaoula Bel Haj Ali; Ahmed Abdelghani; Yosra Ben Daya; Rabie Razgallah; Mohamed Habib Grissa; Kaouthar Beltaief; Zied Mezgar; Asma Belguith; Wahid Bouida; Riadh Boukef; et al. (Therapeutic Advances in Respiratory Disease, 2022)