After data collection, but prior to analysis, inaccuracies in the content of the registration were discovered. Some changes made prior to recruitment of the first participant had not been registered. The inaccuracies were amended in an update, 15 February 2017: 1) The primary outcome measure of iBODE (objective physical health status) was omitted (no data were collected). 2) The time frame for primary outcomes was changed from "Baseline, week 8" to "Baseline, 6 mo. follow-up". 3) Prior to data collection, three variables to be included in moderator and mediator analyses were added (therapeutic working alliance, mindfulness, and breathlessness catastrophizing).