Response to the Commentary “How Do We Spin Wingspan?” - Levy, E.I.; Hopkins, L.N.; Turk, A.S.; Fiorella, D.J.; Rasmussen, P.A.; Masaryk, T.J.; Albuquerque, F.C.; McDougall, C.G.; Pride, G.L.; Welch, B.G.; Purdy, P.D.; Woo, H.H.; et al. (American Journal of Neuroradiology, 2008)