Comment on

• Is the combination of negative computed tomography result and negative lumbar puncture result sufficient to rule out subarachnoid hemorrhage?

  Perry JJ, Spacek A, Forbes M, Wells GA, Mortensen M, Symington C, Fortin N, Stiell IG. Perry JJ, et al. Ann Emerg Med. 2008 Jun;51(6):707-13. doi: 10.1016/j.annemergmed.2007.10.025. Epub 2008 Jan 11. Ann Emerg Med. 2008. PMID: 18191293
• What happens to new-onset headache presented to primary care? A case-cohort study using electronic primary care records.

  Kernick D, Stapley S, Goadsby PJ, Hamilton W. Kernick D, et al. Cephalalgia. 2008 Nov;28(11):1188-95. doi: 10.1111/j.1468-2982.2008.01674.x. Epub 2008 Sep 2. Cephalalgia. 2008. PMID: 18771496
• Nontraumatic headaches in the emergency department: evaluation of a clinical pathway.

  Dutto L, Meineri P, Melchio R, Bracco C, Lauria G, Sciolla A, Pomero F, Sturlese U, Grasso E, Tartaglino B. Dutto L, et al. Headache. 2009 Sep;49(8):1174-85. doi: 10.1111/j.1526-4610.2009.01482.x. Epub 2009 Jul 8. Headache. 2009. PMID: 19619242
• Pearls: headache.

  Dodick DW. Dodick DW. Semin Neurol. 2010 Feb;30(1):74-81. doi: 10.1055/s-0029-1245000. Epub 2010 Feb 1. Semin Neurol. 2010. PMID: 20127586