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Local ethics committees of the participating countries approved data collection and written informed consent was obtained before study participation. All procedures performed involving human participants were in accordance with the local ethical standards and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Data from the validation study was approved by the Danish Data Protection Agency, Ref. No.: 2012-58-0004. Data from the original collections may be available from the EORTC upon reasonable request.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"The authors have no conflict of interest, specifically the authors do not have any financial interests that are directly or indirectly related to the results of this work. The EORTC CAT Core and any CAT based on this are copyrighted, with all rights reserved by the EORTC Quality of Life Group. Academic use of EORTC instruments requires no fee. For commercial use the EORTC requests a compensation fee.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"7"}}