RETRACTED: Two-day seven-day course of levofloxacin in acute COPD exacerbation: a randomized controlled trial by 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, Hamdi Boubaker, Mohamed Amine Msolli, Adel Sekma, Semir Nouira

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