Correction to: BMC Endocrine Disorders (2020) 20:1

https://doi.org/10.1186/s12902-019-0484-y

In the original publication of this article [1] the first affiliation of the authors is incorrect, the correct affiliation of the first one is: Department of Endocrinology and Metabolic Diseases, Polish Mother’s Memorial Hospital – Research Institute, Lodz, Poland.