1. From the Departments of Pulmonology (F.S.d.M., M.L.H., J.J.M.v.B., I.S., P.E.P., N.W., A.V.-N.) and Physiology (M.L.H., J.J.M.v.B., S.J.P.B., J.v.d.V., N.W., W.J.P.), VU University Medical Center/Institute for Cardiovascular Research, Amsterdam, The Netherlands.