Data management {19}
The questionnaires will be checked for completeness and entered by qualified study personnel in the statistical analysis system. After data entry (according to the code book) a data quality check on plausibility will be performed. All questionnaires completed as part of the study will be digitized, archived at the Thoraxklinik after completion of the study, and retained for ten years. For the survey, patients are given a pseudonym. Only the study director has access to the pseudonym list of respondents. Only the digitized data will be shared for analysis. These electronic data are archived after completion and deleted after ten years.