 - Adequately controlled blood pressure BP 140 mmHg systolic and 90 mmHg diastolic taken in the clinic setting by a medical professional within 2 weeks prior to starting study; patients with hypertension may be managed with up to a maximum of 3 antihypertensive medications; a cardiologist or blood pressure specialist must evaluate patients who are on 3 antihypertensive medications within 4 weeks of enrollment 