About the Authors

Melianthe P. J. Nicolai

melianthenicolai@gmail.com

Affiliation Department of Urology, Leiden University Medical Center, Leiden, the Netherlands

Josbert J. Keller

Affiliation Department of Gastroenterology, HAGA Teaching Hospital, The Hague, the Netherlands

Lieke de Vries

Affiliation Department of Urology, Westeinde Hospital, The Hague, the Netherlands

Andrea E. van der Meulen-de Jong

Affiliation Department of Gastroenterology, Leiden University Medical Center, Leiden, the Netherlands

Jan J. Nicolai

Affiliation Department of Gastroenterology, HAGA Teaching Hospital, The Hague, the Netherlands

James C. H. Hardwick

Affiliation Department of Gastroenterology, Leiden University Medical Center, Leiden, the Netherlands

Hein Putter

Affiliation Department of Medical Statistics, Leiden University Medical Center, Leiden, the Netherlands

Rob C. M. Pelger

Affiliation Department of Urology, Leiden University Medical Center, Leiden, the Netherlands

Henk W. Elzevier

Affiliation Department of Urology, Leiden University Medical Center, Leiden, the Netherlands

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MPN JJK AEvdMdJ JJN HWE. Performed the experiments: MPN LdV. Analyzed the data: MPN LdV HP HWE. Contributed reagents/materials/analysis tools: JJK JJN AEvdMdJ. Wrote the paper: MPN. Revised the manuscript for important intellectual content: JJK AEvdMdJ JJN JCH RCP HWE. Final approval of the manuscript: RCP HWE.