Posterior Spinal Fusion in a Scoliotic Patient With Congenital Heart Block Treated With Pacemaker: An Intraoperative Technical Difficulty by Wong, Tat Seng, Abu Bakar, Jaseemuddeen, Chee, Kok Han, Hasan, Mohd Shahnaz, Chung, Weng Hong, Chiu, Chee Kidd, Chan, Chris Yin Wei, Kwan, Mun Keong