About the Authors

Ruud van Winkel

ruud.vanwinkel@upckuleuven.be

Affiliations University Psychiatric Center KU, Leuven, Belgium, Maastricht University Medical Centre, South Limburg Mental Health Research and Teaching Network, EURON, Maastricht, The Netherlands

GROUP Investigators

Membership of the GROUP consortium is provided in the Acknowledgments.

Competing Interests

The authors have declared that no competing interests exist. Group membership co-authors RVW, JVO, IM-G and LDH serve as Academic Editors for PLOS ONE. This does not alter the authors' adherence to PLOS ONE Editorial policies and criteria.

Author Contributions

Conceived and designed the experiments: RVW. Performed the experiments: RVW. Analyzed the data: RVW. Wrote the paper: RVW.