About the Authors
Biosystems Data Analysis, Universiteit van Amsterdam, Amsterdam, The Netherlands
ABC Metabolomics Centre, Lab. Metabolic and Endocrine Diseases, Wilhelmina Children's Hospital, Utrecht, The Netherlands
TNO Quality of Life, Zeist, The Netherlands
The authors have declared that no competing interests exist.
Conceived and designed the experiments: JAH MMWBH JAW AS. Performed the experiments: MJvdW. Analyzed the data: JAH. Contributed reagents/materials/analysis tools: MJvdW. Wrote the paper: JAH MMWBH JAW AS. Group Leader: AS RB MJvdW.