Comment on ``Random-Field Spin Model beyond 1 Loop: A Mechanism for   Decreasing the Lower Critical Dimension"
  A comment on the Letter by Le Doussal and Wiese, Phys. Rev. Lett. 96, 197202 (2006). 
Yoshinori Sakamoto (Nihon University), Hisamitsu Mukaida (Saitama   Medical University), Chigak Itoi (Nihon University)