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Contributors AW analysed the data, performed the literature research and wrote the first draft of the manuscript. TA was responsible for development and realisation of the first survey. HK supervised the development and contributed to the realisation of the first survey. RG was involved in the design of the second questionnaire, centre recruitment and data analysis, and reviewed the manuscript for intellectual content and approved the final version. HM designed the second questionnaire, developed the database, was responsible for data management and centre recruitment. SA was responsible for centre recruitment, development of the database of the second questionnaire. MN supervised the development and realisation of the second survey and acquired hospital funds for the incentive. RML critically reviewed the manuscript for important intellectual content and approved the final version. All listed authors on the manuscript have seen and approved the submitted version of the manuscript and take full responsibility for the manuscript.
Competing interests None declared.
Provenance and peer review Not commissioned; internally peer reviewed.