Correction to: BMC Nephrol

https://doi.org/10.1186/s12882-016-0334-3

Following publication of the original article [1], we have been notified that the approved number by the Ethical Committee was given incorrectly. In the section “Methods” stated that: The Central Ethical Committee of the University Hospital approved the study protocol (B.U.N. 143201318818), this number is incorrect and should be expressed as follows: B.U.N. 143201318819.