5. Use of nonbiologic systemic antipsoriatic therapy (eg, corticosteroids, retinoids, methotrexate, cyclosporine, other immunosuppressive agents), biologic therapy (eg, alefacept, etanercept, efalizumab), or phototherapy (eg, ultraviolet A, psoralen and ultraviolet A, ultraviolet B) within 4 weeks prior to enrollment.