About the Authors

Jan Krul

jk13@home.nl

Affiliation Educare Groningen, Groningen, The Netherlands

Matthijs Blankers

Affiliation Department of Psychiatry, Arkin and Amsterdam Institute for Addiction Research, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands

Armand R. J. Girbes

Affiliation Department of Intensive Care, University Hospital VU Medical Centre, Amsterdam, The Netherlands

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JK ARJG MB. Performed the experiments: JK. Analyzed the data: JK MB. Contributed reagents/materials/analysis tools: JK MB. Wrote the paper: JK ARJG MB.