About the Authors

Jan Boženský

Contributed equally to this work with: Jan Boženský, Richard Zelenka

Affiliation Paediatrics Department, Vitkovice Hospital, Ostrava, Czech Republic

Martin Hill

‡ These authors also contributed equally to this work.

Affiliation Institute of Endocrinology, Prague, Czech Republic

Richard Zelenka

Contributed equally to this work with: Jan Boženský, Richard Zelenka

Richard.Zelenka@humana.de

Affiliation DMK Baby, Bremen, Germany

Tomáš Skýba

‡ These authors also contributed equally to this work.

Affiliation Paediatrics Department, Vitkovice Hospital, Ostrava, Czech Republic

Competing Interests

RZ is employed by the study sponsor. There are no patents, products in development or marketed products to declare. This does not alter the authors' adherence to all the PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: RZ JB. Performed the experiments: JB TS. Analyzed the data: MH. Contributed reagents/materials/analysis tools: RZ. Wrote the paper: RZ JB.