[1] St Antonius Hosp, ILD Ctr Excellence, Dept Pulmonol, Koekoekslaan 1, NL-3435 CM Nieuwegein, Netherlands
[2] Univ Vermont, Larner Coll Med, Burlington, VT USA
[3] Albany Med Coll, Albany, NY 12208 USA
[4] Univ Med Ctr Utrecht, Div Heart & Lungs, Utrecht, Netherlands