[1] Univ Hosp Leuven, Dept Resp Med, Leuven, Belgium
[2] CHU UCL Namur, Yvoir, Belgium
[3] ZNA Middelheim, Antwerp, Belgium
[4] Ctr Hosp Luxembourg, Luxembourg, Luxembourg
[5] CHR Citadelle, Liege, Belgium
[6] CHIREC Hosp, Brussels, Belgium
[7] AZ Groeninge, Kortrijk, Belgium
[8] F Hoffmann La Roche Ltd, Basel, Switzerland
[9] Genentech Inc, San Francisco, CA 94080 USA
[10] Erasme Univ Hosp, Brussels, Belgium