  In this note we prove a refined version of the Christensen-Evans theorem for
generators of uniformly continuous GNS-symmetric quantum Markov semigroups. We
use this result to show the existence of GNS-symmetric extensions of
GNS-symmetric quantum Markov semigroups. In particular, this implies that the
generators of GNS-symmetric quantum Markov semigroups on finite-dimensional von
Neumann algebra can be written in the form specified by Alicki's theorem.
