Erratum: Reply to Letter to the Editor: V. Iaccarino. A proposed anatomical typing of the right internal spermatic vein: Importance for percutaneous sclerotherapy of varicocele (CVIR 30[2]:347, 2007) (Cardiovasc Intervent Radiol (2007) 31 (1045) DOI: 10.1007/s00270-007-9247-7)