"Clinical policy: critical issues in the evaluation and management of adult patients presenting to the emergency department with acute headache". Annals of Emergency Medicine52 (4): 407–436. October 2008. doi:10.1016/j.annemergmed.2008.07.001. PMID18809105.
"Clinical policy: critical issues in the evaluation and management of adult patients presenting to the emergency department with acute headache". Annals of Emergency Medicine52 (4): 407–436. October 2008. doi:10.1016/j.annemergmed.2008.07.001. PMID18809105.