Reporting Guidelines for the Early-Phase Clinical Evaluation of Applications Using Extended Reality: RATE-XR Qualitative Study Guideline - Johan H Vlake; Denzel LQ Drop; Jasper Van Bommel; Giuseppe Riva; Brenda K Wiederhold; Pietro Cipresso; Albert S Rizzo; Barbara O Rothbaum; Cristina Botella; Lotty Hooft; Oscar J Bienvenu; Christian Jung; et al. (Journal of Medical Internet Research)