Chavasiri C, Chavasiri S, Unnanantana A. Single Level of Posterior Closing-Wedge and Anterior Extension Lumbar Osteotomy for Ankylosing Spondylitis. Siriraj Med J [Internet]. 1999 Jul. 1 [cited 2024 May 2];51(7):485-91. Available from: https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/247008