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The study was approved by the Norwegian Regional Committee for Medical and Health Research Ethics, Region South-East (IRB approval no S-02036) and the Protocol Committee of Oslo University Hospital, Oncological department (ref: 2002\u201315) and finally by the Norwegian Centre for Research Data (NSD) (ref: 2004\/00008 CBR\/\u2212).","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics Approval and Consent to Participate"}},{"value":"All authors declare that they have no potential conflicts of interest.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing Interests"}}]}}