Faculty of Medicine, University of Calgary, Calgary, Alberta, Canada; Respiratory Medicine, Royal Infirmary, Edinburgh, Scotland, United Kingdom; Philadelphia Veterans Affairs Medical Center, Philadelphia, Pennsylvania; Pneumology Department, Cliniques Universitaires Saint-Luc, Universite Catholique de Louvain, Brussels, Belgium; and Department of Respiratory Medicine, Westmead Hospital, Wentworthville, New South Wales, Australia
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Flemons et al. (2004) studied this question.
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