The effects of DL-3-n-butylphthalide in patients with vascular cognitive impairment no dementia caused by subcortical ischemic small vessel disease: A multicentre, randomized, double-blind, placebo-controlled trial … Visit site: The effects of DL-3-n-butylphthalide in patients with vascular cognitive impairment no dementia caused by subcortical ischemic small vessel disease: A multicentre, randomized, double-blind, placebo-controlled trial