Key points are not available for this paper at this time.
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
Flemons et al. (Mon,) studied this question.