1 From the Division of Cardiology (G.B.J.M.) and Division of Respiratory Medicine (J.A.F.), Department of Medicine, University of British Columbia, Vancouver, Canada. mancini@mail.ubc.ca.
2 From the Division of Cardiology (G.B.J.M.) and Division of Respiratory Medicine (J.A.F.), Department of Medicine, University of British Columbia, Vancouver, Canada.