  Scale factor matrices relating mesonic fields in chiral Lagrangians and
quark-level operators of QCD sum-rules are shown to be constrained by chiral
symmetry, resulting in universal scale factors for each chiral nonet. Built
upon this interplay between chiral Lagrangians and QCD sum-rules, the scale
factors relating the $a_0$ isotriplet scalar mesons to their underlying quark
composite field were recently determined. It is shown that the same technique
when applied to $K_0^*$ isodoublet scalars reproduces the same scale factors,
confirming the universality property and further validating this connection
between chiral Lagrangians and QCD sum-rules which can have nontrivial impacts
on our understanding of the low-energy QCD, in general, and the physics of
scalar mesons in particular.
