- Prednisolone and valaciclovir in Bell's palsy: a randomised, double-blind, placebo-controlled, multicentre trial. Engström, M., Berg, T., Stjernquist-Desatnik, A., Axelsson, S., Pitkäranta, A., Hultcrantz, M., Kanerva, M., Hanner, P., Jonsson, L. Lancet. Neurol (2008)