Prednisolone and valaciclovir in Bell’s palsy: a randomised, double-blind, placebo-controlled, multicentre trial - Engstrom, M; Berg, T; Stjernquist-Desatnik, A; Axelsson, S; Pitkaranta, A; Hulcrantz, M; Kanerva, M; Hanner, P; Jonsson, L (Lancet Neurol, 2008)