[1] Univ Aquila, Dept Appl Clin Sci & Biotechnol, Laquila, Italy
[2] Univ Hosp, Dept Gynecol, Clin Reprod Endocrinol, Zurich, Switzerland
[3] Bispebjerg Hosp, Dept Neurol, Copenhagen, Denmark
[4] Univ Copenhagen, Copenhagen, Denmark
[5] Univ Hosp Basel, Dept Obstet & Gynecol, Basel, Switzerland
[6] Univ Paris Saclay, Univ Paris Sud, UVSQ, CESP,Inserm,UMRS1018, Paris, France
[7] Charite Univ Med Berlin, Inst Publ Hlth, Berlin, Germany
[8] Headache Med Ctr Seilerstaette Linz, Linz, Austria
[9] Ordensklinikum Linz, Dept Geriatr Med, Linz, Austria
[10] Univ Copenhagen, Dept Obstet & Gynaecol, Rigshosp, Fac Hlth Sci, Copenhagen, Denmark
[11] Barts & London Queen Marys Sch Med & Dent, Ctr Neurosci & Trauma, BICMS, London, England
[12] St Bartholomews Hosp, Barts Sexual Hlth Ctr, London, England
[13] Erasmus MC, Div Vasc Med & Pharmacol, Dept Internal Med, Rotterdam, Netherlands
[14] Univ Athens, Aeginit Hosp, Dept Neurol, Athens, Greece
[15] Univ Pavia, Dept Clin Surg Diagnost & Pediat Sci, IRCCS S Matteo Fdn, Res Ctr Reprod Med Gynecol Endocrinol & Menopause, Pavia, Italy
[16] Univ Pavia, Univ Consortium Adapt Disorders & Head Pain UCADH, Pavia, Italy
[17] Univ Thessaly, Dept Med, Larisa, Greece
[18] Oslo Univ Hosp, Dept Haematol, Oslo, Norway
[19] Univ Oslo, Oslo, Norway
[20] Sapienza Univ Rome, Dept Clin & Mol Med, Rome, Italy
[21] St Andrea Hosp, Reg Referral Headache Ctr, Rome, Italy