- Article
PER Gene Family Polymorphisms in Relation to Cluster Headache and Circadian Rhythm in Sweden
- Felicia Jennysdotter Olofsgård,
- Caroline Ran,
- Carmen Fourier,
- Catalina Wirth,
- Christina Sjöstrand,
- Elisabet Waldenlind,
- Anna Steinberg and
- Andrea Carmine Belin
The trigeminal autonomic cephalalgia, cluster headache (CH), is one of the most painful disorders known to man. One of the disorder’s most striking features is the reported diurnal rhythmicity of the attacks. For a majority of patients, the headache...

