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In the original article (Chen et al. 2010), the authors inadvertently did not reference their previous work to which this article (Chen et al. 2010) is related. The reference list has been updated with the addition of Chen et al. (2008) to reflect this. The authors apologize for any inconvenience they might have caused.

Correction to: Short-term manpower planning for MRT carriage maintenance under mixed deterministic and stochastic demands