In this prospective , open-label , randomized , active-controlled , multicenter 8-week study , patients not meeting the target BP after 4 weeks of treatment with low-dose monotherapy were randomized to receive nifedipine GITS 30mg plus valsartan 80mg ( N30 + V80 ) , nifedipine GITS 60mg ( N60 ) , or valsartan 160mg ( V160 ) for a further 4 weeks .