Erratum: Effective Lorentz Force due to Small-Angle Impurity Scattering:   Magnetotransport in High-$T_c$ Superconductors
  The equations in cond-mat/0011020 and Phys. Rev, Lett. 86, 4652 (2001) are valid but a numerical estimate in the paper is incorrect. 
C.M. Varma and Elihu Abrahams