Updates are available Correction dated 2018-06-15

Article History

Received: 28 December 2017

Revised: 1 March 2018

Accepted: 2 March 2018

First Online: 7 April 2018

Change Date: 15 June 2018

Change Type: Correction

Change Details: The original publication contained an erroneous version of Table 3 with incorrect data regarding ureteral visibility. The authors apologize for any inconvenience caused by their mistake and are pleased to present the corrected table here.

Compliance with ethical standards

: The study protocol was approved by the ethics committee at Helsinki University Hospital.

: The authors declare that they have no conflict of interest.