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J Batra, T P Singh, U Mabalirajan, et al. Association of inducible nitric oxide synthase with asthma severity, total serum immunoglobulin E and blood eosinophil levels (Thorax 2007;62:16–22). This article was originally published with an incorrect digital object identifier (doi). It has been updated with the correct doi: 10.1136/thx.2005.057935. We apologise for any inconvenience caused.