1. Clinic for Reproductive Endocrinology, Department of Gynaecology and Obstetrics, University Hospital Zürich, Zurich, Switzerland;
2. Headache outpatient Clinic, Department of Neurorehabilitation, Reha Clinic Bad Zurzach & Baden, Bad Zurzach, Switzerland;
3. Headache and Pain Unit, Department for Neurology, University Hospital Zürich, Zurich, Switzerland