<qa>  What is the treatment phase of the study?Safety evaluations during the study include the collection of adverse events, laboratory tests including blood chemistry and urinalysis, physical examinations, vital signs blood pressure and heart rate and post-void residual urine volume. Over-encapsulated DITROPAN XL, 10 mg tablets once-daily by mouth or over-encapsulated DETROL LA, 4 mg capsules once daily by mouth. The treatment phase of the study runs for 12 weeks. 