Funding for this research was provided by:
Text and Data Mining valid from 2019-09-16
Received: 10 April 2019
Accepted: 26 August 2019
First Online: 16 September 2019
Compliance with ethical standards
: MtL is a board member of the Dutch Society of Neuro-Oncology. All other authors declare that they have no conflict of interest.
: All procedures performed in the studies involving human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.