1 Department of Orofacial Pain and Dysfunction, Academic Centre for Dentistry Amsterdam, University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam 1081, Netherlands. Electronic address: m.c.verhoeff@acta.nl.
2 Amsterdam UMC, Department of Neurology, Vrije Universiteit Amsterdam, Amsterdam, Netherlands.
3 Department of Orofacial Pain and Dysfunction, Academic Centre for Dentistry Amsterdam, University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam 1081, Netherlands.