Sildenafil-Induced Cervical Spinal Cord InfarctionAJNR 33:e32-e33, Walden,J.E. & Castillo,M., 2012
Transient Ischemic Attack and Stroke Associated with Sildenafil (Viagra) UseNeurol 57:1730-1731, Morgan,J.C.,et al, 2001