Text and Data Mining valid from 2019-04-05
Received: 3 March 2019
Revised: 22 March 2019
Accepted: 25 March 2019
First Online: 5 April 2019
Compliance with ethical standards
: This study has been performed in accordance with the national regulative law for the handling of biological specimens from tumor banks, being the samples exclusively available for research purposes in retrospective studies, as well as under the international Helsinki declaration. Ethical approval and informed consent were not required for this study.
: The authors declare that they have no conflict of interest.