Objective 2 of the trial is to evaluate whether renal failure progression in patients treated with a fixed dose of ramipril can be further slowed down by additional antihypertensive treatment, achieving a blood pressure below the 50th percentile. To this end, patients will be randomized upon initiation of ramipril to either intensified (aiming below 50th percentile of 24-hour mean arterial pressure) or conventional antihypertensive treatment.