G Sagiroglu E Copuroglu S Hekimoglu Y Yoruk A Karamustafaoglu I Yildirim Postoperative thoracic epidural analgesia in a patient with ankylosingspondylitis III NWAC 2012 World Anesthesia Convention Hilton İstanbul April 24 28 2012 Poster no 47 661 P 72