Lenz, B. http://orcid.org/0000-0001-6948-5171
,
Katsarava, Z. http://orcid.org/0000-0002-9932-1159
Gil-Gouveia, R.
Karelis, G.
Kaynarkaya, B.
Meksa, L.
Oliveira, E.
Palavra, F.
Rosendo, I.
Sahin, M.
Silva, B.
Uludüz, D.
Ural, Y. Z.
Varsberga-Apsite, I.
Zengin, S. T.
Zvaune, L.
Steiner, T. J.
Funding for this research was provided by:
Novartis Pharma
Article History
Received: 3 February 2021
Accepted: 31 March 2021
First Online: 28 April 2021
Declarations
:
: Ethics approvals were obtained in accordance with national requirements: from the Ethics Commission of the Westphalia-Lippe Medical Association and the Westphalian Wilhelm University of Münster for the German part of this study and from the Centre Regional Health Administration Ethics Committee (ARS Centro, Portugal) for the Portuguese part. Approvals were not required in Turkey or Latvia for projects with the primary purpose of service improvement.
: Not applicable.
: TJS and ZK are Directors and Trustees of <i>Lifting The Burden</i>. ZK is President of the European Headache Federation. Other than these, no author has competing interests relevant to the subject matter of this manuscript.