A COMPARISON OF PULLOUT STRENGTH OF PEDICULAR SCREWS BETWEEN DIFFERENT METHODS OF SCREW INSERTION IN POSTERIOR FIXATION OF THORACIC SPINE - Habib-Allah -Zadeh, P; Mirzashahi, B; Sadat, M; Siavashi, B; Mohammad-Hosseini, B; Mohammad-Hosseini, S; Ziaei-Moayyed, A (Acta Medica Iranica)