Validation Study of Rajasekaran’s Kyphosis Classification System: Do We Clearly Understand Single- and Two-Column Deficiencies? oleh Ajoy Prasad Shetty, Rajesh Rajavelu, Vibhu Krishnan Viswanathan, Kota Watanabe, Harvinder Singh Chhabra, Rishi Mukesh Kanna, Jason Pui Yin Cheung, Yong Hai, Mun Keong Kwan, Chung Chek Wong, Gabriel Liu, Saumajit Basu, Abhay Nene, J. Naresh-Babu, Bhavuk Garg