Michelle Welman, F. H. S.
Smit, Albertine E.
Jongen, Joost L. M.
Tibboel, Dick
van der Geest, Jos N.
Holstege, Jan C.
Funding for this research was provided by:
Pijnkennis Centrum Rotterdam
Article History
First Online: 26 February 2018
Compliance with Ethical Standards
: All experiments were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. Subjects have given written informed consent prior to the study.
: The authors declare that they have no conflicts of interest.