1. University Centre for Adaptive Disorders and Headache (UCADH), IRCCS C. Mondino Foundation Institute of Neurology, Pavia; University ‘La Sapienza’, Rome, Italy
2. Danish Headache Research Centre, Department of Neurology, University of Copenhagen, Glostrup Hospital, Glostrup, Denmark
3. Department of Obstetrics and Gynaecology, IRCCS ‘Policlinico S. Matteo’, University of Pavia and University Centre for Adaptive Disorders and Headache (UCADH)
4. Headache Unit, IRCCS C. Mondino Foundation Institute of Neurology, Pavia and University Centre for Adaptive Disorders and Headache (UCADH), Pavia
5. Headache Centre, Section of Neurology, Department of Neuroscience, University of Parma, Parma and University Centre for Adaptive Disorders and Headache (UCADH), Pavia, Italy