Effect of valacyclovir on viral shedding in immunocompetent patients with recurrent herpes simplex virus 2 genital herpes: a US-based randomized, double-blind, placebo-controlled clinical trial. - Fife KH; Warren TJ; Ferrera RD; Young DG; Justus SE; Heitman CK; Burroughs SM (Mayo Clinic Proceedings, 2006)