Retraction: Chanimov M, Evron S, Haitov Z, Stolero S, Cohen ML, Friedland M, Shul I, Bahar M. Accidental venous and dural puncture during epidural analgesia in obese parturients (BMI > 40 kg/m2): three different body positions during insertion. J Clin Anesth 2010;22:614-618