1 Department of Oral Surgery, University Hospital of Düsseldorf, Düsseldorf, Germany.
2 Department of Neurosciences, University of Padua, Padua, Italy.
3 Centre for Oral Clinical Research, Barts and the London School of Medicine and Dentistry, Institute of Dentistry, Queen Mary University of London, London, United Kingdom.
4 Department of Medical Sciences, University of Ferrara, Ferrara, Italy.