Data from: Red and orange flags for secondary headaches in clinical practice: SNNOOP10 list

Thien Phu Do, Angelique Remmers, Henrik Winther Schytz, Christoph Schankin, Sarah E. Nelson, Mark Obermann, Jakob Møller Hansen, Alexandra J. Sinclair, Andreas R. Ganteinbein & Guus G. Schoonman
A minority of headache patients have a secondary headache disorder. The medical literature presents and promotes red flags to increase the likelihood of identifying a secondary etiology. In this review, we aim to discuss the incidence and prevalence of secondary headaches as well as the data on sensitivity, specificity, and predictive value of red flags for secondary headaches. We review the following red flags: (1) systemic symptoms including fever; (2) neoplasm history; (3) neurologic deficit...
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These counts follow the COUNTER Code of Practice, meaning that Internet robots and repeats within a certain time frame are excluded.
What does this mean?