1. Department of Pulmonology, Erasmus MC-Daniel Den Hoed Cancer Center, Rotterdam, The Netherlands
2. Department of Pulmonology, Amphia Hospital, Breda, The Netherlands
3. Department of Pulmonology, St. Franciscus Gasthuis, Rotterdam, The Netherlands
4. Department of Pulmonology, St. Antonius, Nieuwegein, The Netherlands
5. Department of Trials and Statistics, Erasmus MC-Daniel Den Hoed Cancer Center, Rotterdam, The Netherlands