The final, formatted version of the article will be published soon. Abstract: Background: The sphenopalatine ganglion (SPG) plays a pivotal role in regulating various head and facial diseases, such as ...

aHeadache Research Unit, Department of Neurology, University of Liège, Belgium Many people who suffer from primary headache (ie, headache without an identifiable cause) are resistant or intolerant to ...

Describes the nature of a clinical study. Types include: Observational study — observes people and measures outcomes without affecting results. Interventional study (clinical trial) — studies new ...