Cluster Headache

• Kaiming Liu — Hangzhou, Zhejiang, China

• Leiden University Medical Center (LUMC) — Leiden, Netherlands
• Canisius-Wilhelmina Ziekenhuis (CWZ) — Nijmegen, Netherlands

• Hopital La Timone — Marseille, France
• Hôpital de Cimiez — Nice, France

• Clinical Pharmacology & Toxicology, University Hospital Basel — Basel, Switzerland

• Fang Luo — Beijing, Beijing Municipality, China

• Praxisklinik Ulmenhof — Hamburg, Germany
• Fondazione IRCCS Istituto Neurologico Carlo Besta (CBNI) — Milan, Italy
• St Olavs Hospital — Trondheim, Norway
• Department of Neurology, University Clinic Hospital. Catholic University of Valencia — Valencia, Spain

• IRCCS Mondino Foundation — Pavia, Italy

Not specified

• The University of Texas Health Science Center at Houston — Houston, Texas, United States

• Beijing Tiantan Hospital — Beijing, Beijing Municipality, China