This is a multi-center, randomized, double-blind, parallel group comparison study in approximately 196 enrolled subjects (~28 subjects/test article) at approximately eight (8) sites. A minimum of 147 patients will be enrolled. Up to an additional 56 subjects (up to 196 subjects) may be enrolled based on enrollment rates and availability of patients. Enrollment status reports will be periodically generated, and based on enrollment experience, additional randomization blocks will be assigned to sites with the potential to enroll additional subjects over a reasonable period of time.