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Alqahtani, Jaber S., Njoku, Chidiamara M., Bereznicki, Bonnie, Wimmer, Barbara C., Peterson, Gregory M., Kinsman, Leigh, Aldabayan, Yousef S., Alrajeh, Ahmed M., Aldhahir, Abdulelah M., Mandal, Swapna, Hurst, John R.. European Respiratory Society; 2020. Risk factors for all-cause hospital readmission following exacerbation of COPD: A systematic review and meta-analysis.