About the Authors

Michiel L. Houben

Affiliation Department of Pediatrics, Wilhelmina Children's Hospital, Utrecht University Medical Center, Utrecht, The Netherlands

Peter G. J. Nikkels

Affiliation Department of Pathology, Utrecht University Medical Center, Utrecht, The Netherlands

Grada M. van Bleek

Affiliation Department of Pediatrics, Wilhelmina Children's Hospital, Utrecht University Medical Center, Utrecht, The Netherlands

Gerard H. A. Visser

Affiliation Department of Gynecology and Obstetrics, Wilhelmina Children's Hospital, Utrecht University Medical Center, Utrecht, The Netherlands

Maroeska M. Rovers

Affiliation Department of Epidemiology, Utrecht University Medical Center, Utrecht, The Netherlands

Hilda Kessel

Current address: Department of Gynecology and Obstetrics, Bovenij Hospital, Amsterdam, The Netherlands

Affiliation Department of Gynecology and Obstetrics, Diakonessen Hospital, Utrecht, The Netherlands

Wouter J. de Waal

Affiliation Department of Pediatrics, Diakonessen Hospital, Utrecht, The Netherlands

Leontine Schuijff

Current address: Department of Orthopedic Surgery, Utrecht University Medical Center, Utrecht, The Netherlands

Affiliation Department of Pediatrics, Wilhelmina Children's Hospital, Utrecht University Medical Center, Utrecht, The Netherlands

Annemiek Evers

Affiliation Department of Gynecology and Obstetrics, Wilhelmina Children's Hospital, Utrecht University Medical Center, Utrecht, The Netherlands

Jan L. L. Kimpen

Affiliation Department of Pediatrics, Wilhelmina Children's Hospital, Utrecht University Medical Center, Utrecht, The Netherlands

Louis Bont

L.J.Bont@umcutrecht.nl

Affiliation Department of Pediatrics, Wilhelmina Children's Hospital, Utrecht University Medical Center, Utrecht, The Netherlands

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MLH PGN GMvB GHV MMR HK WJdW LS AE JLK LB. Performed the experiments: MLH PGN GMvB LS. Analyzed the data: MLH PGN GMvB GHV MMR JLK LB. Wrote the paper: MLH PGN GMvB GHV MMR HK WJdW LS AE JLK LB. Collected the data: MLH PGJN HK WJdW LS AE.