 Within seven 7 to fourteen 14 days of Visit 1, eligible patients will return for an abbreviated scintigraphy test with images obtained only at 4 and 24 hours following In111 capsule ingestion. A geometric center at 24 hours must be less than or equal to 2.30 to qualify for randomization to study medication. The assigned medication is either 10 or 20 mg A3309 or placebo administered orally once daily for fourteen 14 consecutive days. The allocation to treatment group will be concealed. 