 This is a single arm one group of patients, open-label all people know the identity of the intervention multicenter 6-month study. Throughout the study flexible dosing of paliperidone ER in a range of 3 to 12 mgday may be used. Flexible dosing will allow investigators to adjust the dosage of each patient based on the individual needs. Patients will receive 3, 6, 9 or 12 mg of paliperidone ER once daily for 6 months. The tablets will be taken orally. Adjustment of the dosage will be done at the investigators discretion, based on the individual patients clinical response and tolerability to the study drug. 