Funding for this research was provided by:
Associazione Italiana per la Ricerca sul Cancro (21198)
Text and Data Mining valid from 2019-11-04
Received: 24 March 2019
Revised: 29 April 2019
Accepted: 31 May 2019
First Online: 4 November 2019
Compliance with ethical standards
: The present study was conducted according to the principles of the Helsinki declaration after approval of the internal review board, the National Research Ethics Service, Research Ethics Committee 4 (REC Reference number 09/H0715/64).
: The authors declare that they have no conflict of interest.