Qualitative concept elicitation and cognitive debriefing interviews of symptoms, impacts and selected customized PROMIS® Short Forms: a study in patients with axial spondyloarthrit... oleh Amy Findley, Jessica M. Middlehurst, Chloe A. Howse, Molly J. Clifford, William Neill, Sophi Tatlock, Wen-Hung Chen, Marguerite G. Bracher, Dharm S. Patel