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Sleep-related oxygen desaturation and daytime pulmonary haemodynamics in COPD patients
P Levi-Valensi, E Weitzenblum, Z Rida, P Aubry, A Braghiroli, C Donner, M Aprill, J Zielinski, G Wurtemberger
European Respiratory Journal 5 (3) 301-307; DOI: 10.1183/09031936.93.05030301 Published 1 March 1992