clifton-sykes-sr-v-kenneth-s-apfel-commissioner-of-social-security , 228 F.3d 259 ( 2000 )
Winston Moore v. Kenneth S. Apfel, Commissioner of the Social Security Administration , 216 F.3d 864 ( 2000 )
Sullivan v. Zebley , 110 S. Ct. 885 ( 1990 )