Liu L, Wu J, Geng J, et al. Geographical prevalence and risk factors for pterygium: a systematic review and meta-analysis. BMJ Open 2013;3:e003787. doi: 10.1136/bmjopen-2013-003787
In the abstract, the sentence:
“We found a trend that the higher pooled prevalence of pterygium was associated with increasing geographical latitude and age in the world.”
should read:
“We found a trend that the higher pooled prevalence of pterygium was associated with decreasing geographical latitude and age in the world.”