Comment on

• Smoking and two human leukocyte antigen genes interact to increase the risk for multiple sclerosis.

  Hedström AK, Sundqvist E, Bäärnhielm M, Nordin N, Hillert J, Kockum I, Olsson T, Alfredsson L. Hedström AK, et al. Brain. 2011 Mar;134(Pt 3):653-64. doi: 10.1093/brain/awq371. Epub 2011 Feb 8. Brain. 2011. PMID: 21303861
• The major histocompatibility complex and multiple sclerosis: a smoking gun?

  Sawcer S, Hellenthal G. Sawcer S, et al. Brain. 2011 Mar;134(Pt 3):638-40. doi: 10.1093/brain/awq384. Epub 2011 Feb 9. Brain. 2011. PMID: 21310724 No abstract available.
• Diagnostic criteria in multiple sclerosis: headed in the right direction but still a ways to go.

  Rudick RA. Rudick RA. Ann Neurol. 2011 Feb;69(2):234-6. doi: 10.1002/ana.22388. Ann Neurol. 2011. PMID: 21387367 No abstract available.
• Diagnostic criteria for multiple sclerosis: 2010 revisions to the McDonald criteria.

  Polman CH, Reingold SC, Banwell B, Clanet M, Cohen JA, Filippi M, Fujihara K, Havrdova E, Hutchinson M, Kappos L, Lublin FD, Montalban X, O'Connor P, Sandberg-Wollheim M, Thompson AJ, Waubant E, Weinshenker B, Wolinsky JS. Polman CH, et al. Ann Neurol. 2011 Feb;69(2):292-302. doi: 10.1002/ana.22366. Ann Neurol. 2011. PMID: 21387374 Free PMC article.
• Effects of cannabis on cognitive function in patients with multiple sclerosis.

  Honarmand K, Tierney MC, O'Connor P, Feinstein A. Honarmand K, et al. Neurology. 2011 Mar 29;76(13):1153-60. doi: 10.1212/WNL.0b013e318212ab0c. Neurology. 2011. PMID: 21444900 Free PMC article.