Effects of modafinil on dopamine and dopamine transporters in the male human brain: clinical implications. - Volkow ND; Fowler JS; Logan J; Alexoff D; Zhu W; Telang F; Wang GJ; Jayne M; Hooker JM; Wong C; Hubbard B; Carter P; et al. (JAMA: Journal of the American Medical Association, 2009)