Right-to-left shunt and subclinical ischemic brain lesions in Chinese migraineurs: a multicentre MRI study oleh Xiao-han Jiang, Si-bo Wang, Qian Tian, Chi Zhong, Guan-ling Zhang, Ya-jie Li, Pan Lin, Yong You, Rong Guo, Ying-hua Cui, Ying-qi Xing