2. For treatment-naïve patients: hypertension defined by a mean seated diastolic blood pressure (DBP) equal or more than 100 mmHg measured by manual cuff sphygmomanometry at visit 1 and 2; For pretreatment patients: hypertension defined by a mean seated diastolic blood pressure equal or more than 90 mmHg at visit 1 and equal or more than 100 mmHg at visit 2 measured by manual cuff sphygmomanometry