Article History
Received: 28 May 2018
Revised: 22 October 2018
Accepted: 27 November 2018
First Online: 4 December 2018
Compliance with ethical standards
: All cases included in the present study were identified from the SIOP UK 2001 Trial and Study, which recruited patients in the UK, and for whose inclusion a full, informed consent has been obtained.
: The authors declare that there is no conflict of interest.