A Multi-center, Randomized, Double-blind,Placebo-controlled Study Comparing 80 mg of Adalimumab With Placebo, and Demonstrating the Non-inferiority of Monthly 80 mg Adalimumab Dosing Compared With 40 mg Adalimumab Every Other Week Dosing

To demonstrate the efficacy of 80 mg adalimumab monthly dosing compared with placebo and demonstrate the non-inferiority of monthly dosing of 80 mg adalimumab compared with dosing of 40 mg adalimumab every other week.