We formulate Poisson-Lie T-duality in a path-integral manner that allows us
to analyze the quantum corrections. Using the path-integral, we rederive the
most general form of a Poisson-Lie dualizeable background and the generalized
Buscher transformation rules it has to satisfy.Comment: 16 pages, plain LaTeX 2e, one paragraph added to the conclusions;
this is the final version accepted by Physics Letters