Text and Data Mining valid from 2018-11-12
Received: 9 May 2018
Revised: 24 September 2018
Accepted: 22 October 2018
First Online: 12 November 2018
Compliance with ethical standards
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the medical ethics committee of the VU University medical center (Netherlands) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: The authors declare that they have no conflict of interest.
: Informed consent was obtained from all individual participants included in the study and their legal guardians.