About the Authors

Eva Kolwijck

Affiliation Department of Obstetrics and Gynecology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

Ron A. Wevers

r.wevers@labgk.umcn.nl

Affiliation Laboratory of Pediatrics and Neurology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

Udo F. Engelke

Affiliation Laboratory of Pediatrics and Neurology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

Jannes Woudenberg

Affiliation Department of Gastroenterology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

Johan Bulten

Affiliation Department of Pathology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

Henk J. Blom

Affiliation Department of Clinical Chemistry, VU University Medical Center, Amsterdam, The Netherlands

Leon F. A. G. Massuger

Affiliation Department of Obstetrics and Gynecology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Wrote the paper: EK. Study design and supervision: RAW LFAGM. NMR support and responsibility for first detection of NAA in cyst fluid samples: UE. Liver cyst study: JW. Pathological diagnoses: JB. GCMS measurements on NAA: HB.