Bacigaluppi S, Piccinelli M, Antiga L, Veneziani A, Passerini T, Rampini P, Zavanone M, Severi P, Tredici G, Zona G, Krings T, Boccardi E, Penco S, Fontanella M. Factors affecting formation and rupture of intracranial saccular aneurysms. Neurosurg Rev. 2014 Jan; 37(1):1-14.