Correction to: World Journal of Urology (2019) 37:1543–1549 https://doi.org/10.1007/s00345-019-02716-8

The authors have requested the removal of the Excel file in Electronic Supplementary Material of the original article to protect patient’s privacy. Hence, the contents in the Excel file were removed and replaced with the following text:

Unfortunately, we had to remove the original Excel file in Electronic Supplementary Material, because of changed privacy legislation.