Following publication of the original article [1], in this article the reference [27] has been updated as shown below:

O’Donnell O, van Doorslaer E, Wagstaff A, Lindelow M. Analyzing health equity using household survey data [Internet]. Analyzing health equity using household survey data. Washington, DC: World Bank Group; 2007. Available from: http://documents.worldbank.org/curated/en/633931468139502235/Analyzing-health-equity-using-household-survey-data-a-guide-to-tech­niques-and-their-implementation

The original article has been corrected.