In the recently published article by Pollak et al. (2013), a crucial word is missing from the title and should be corrected.
The additional word is receptor and the correct title should read:
Prevalence of anti-N-methyl-d-aspartate (NMDA) receptor antibodies in patients with schizophrenia and related psychoses: a systematic review and meta-analysis.
The error has now been rectified in the original online and print PDF and HTML copies of this article.