Corrigendum to "On pairwise compatibility graphs having Dilworth number two" [Theoret. Comput. Science (2014) 34-40]

In 4 we put in relation graphs with Dilworth number at most two and the two classes LPG and mLPG. In order to prove this relation, we have heavily exploited a result we deduced from 1. We have now realized that this result is not always true, so in this corrigendum we correctly restate the result concerning the relation between graphs with Dilworth number at most two and the two classes of LPG and mLPG.