Toward the Development of a Comprehensive Clinically Oriented Patient Profile: A Systematic Review of the Purpose, Characteristic, and Methodological Quality of Classification Systems of Adult Spinal Deformity. Issue 6 (13th May 2021) - Kwan, Kenny Yat Hong; Naresh-Babu, J; Jacobs, Wilco; de Kleuver, Marinus; Polly, David W; Yilgor, Caglar; Wu, Yabin; Park, Jong-Beom; Ito, Manabu; van Hooff, Miranda L