Article 2 adult 2 artery diameter basilar artery 2 clinical article 2 female 2 human 2 Adult 1 Basilar Artery 1 Carotid Artery, Internal 1 Cerebrovascular Circulation 1 Estrogens 1 Humans 1 Magnetic Resonance Angiography 1 Menstrual Cycle 1 Neurovascular Coupling 1 Progesterone 1 Spin Labels 1 Student t test 1 Young Adult 1 angiography 1 arterial spin Labelling 1 arterial spin labeling 1 artery dysplasia 1 basilar artery fenestration 1 blood 1 blood clotting 1 blood sampling 1 brain blood flow 1 brain circulation 1