A Phase III Multicentre, Double-Blind, Active-Controlled, Parallel Study Comparing the Efficacy and Safety of ZOVIRAX Cold Sore Cream (Aciclovir 5% Cream) and Lidocaine 2% to ZOVIRAX Cold Sore Cream Alone Administered for 5 Days in Subjects with Herpes Labialis Infection., Trial ID ZOV30009 | GSK