Xu's quantization conjecture for Lie bialgebroids

Let $(E,E^*)$ be a Lie bialgebroid. A quantization is a topological deformation of the standard associative bialgebroid structure on the universal enveloping algebra $\mathcal{U}_{R}(E)$, with $R\equiv\mathscr C^\infty(\mathscr{M})$, whose semiclassicalisation reproduces the given Lie bialgebroid structure; such a quantum object is called a quantum groupoid. Xu's conjecture. Every Lie bialgebroid admits a quantization as a quantum groupoid. Quantization is known for Lie bialgebroids associated with Poisson manifolds, regular triangular Lie algebroids, and generic triangular Lie bialgebroids, but the conjecture remains open for a generic Lie bialgebroid.