Statistical analysis
Categorical data are presented as numbers and percentages. Continuous data were skewed and therefore presented as median and interquartile ranges (IQR). Differences in characteristics of patients with and without URVs were analyzed using XThe XInter-rater reliability regarding the initial determination of reasons and categories of URVs was measured with Cohen’s kappa coefficient.Statistical analyses were performed using the Statistical Package for the Social Sciences (IBM Corp. Released 2019. IBM SPSS Statistics, Version 26.0. Armonk, NY, USA).