A decreased waist area is a risk factor of recurrent nephrolithiasis after ureteroscopy for Nonobese female patients: a retrospective study from a regional referral hospital in Japan

Trial registration was not performed, and the number of clinical trials was not suitable because this was a retrospective observational study at a single institution. All participants were retrospectively registered, and the study was approved by the Institutional Review Board and Ethics Committee of the Faculty of Medicine, Saga Japan (number 2023-11-R-4) at the date of 2/02/2024.