Comparison of endoscopic versus CT assessment of stone-free status after percutaneous nephrolithotomy (PCNL).

"Declarations Conflicts of interestFriedrich O. Hartung, Kim Julia Müller, Britta Gruene, Jonas Herrmann, Maurice S. Michel and Marie-Claire Rassweiler-Seyfried have no conflicts of interest or financial ties to disclose. Ethical approvalThe study received the ethics approval by the Ethikkommission II Medizinische Fakultät Mannheim (Germany) and received an authorization as of May 2020 with the trial registration ID: 2020-837R. Research was conducted ethically in accordance with the World Medical Association Declaration of Helsinki. Due to the purely retrospective data evaluation, no consent of the patients was required according to the ethics committee. Conflicts of interest Friedrich O. Hartung, Kim Julia Müller, Britta Gruene, Jonas Herrmann, Maurice S. Michel and Marie-Claire Rassweiler-Seyfried have no conflicts of interest or financial ties to disclose."

"Funding Open Access funding enabled and organized by Projekt DEAL. This manuscript did not receive any funding."