About the Authors

Viktoria Johansson

Affiliation Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden

Rolf Nybom

Affiliation Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden

Lennart Wetterberg

lennart.wetterberg@ki.se

Affiliation Department of Clinical Neuroscience at St. Göran, Karolinska Institutet, Stockholm, Sweden

Christina M. Hultman

Affiliation Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden

Tyrone D. Cannon

Affiliation Departments of Psychology and Psychiatry and Biobehavioral Sciences, University of California Los Angeles, Los Angeles, California, United States of America

Anette G. M. Johansson

Affiliation Department of Clinical Neuroscience at St. Göran, Karolinska Institutet, Stockholm, Sweden

Carl Johan Ekman

Affiliation Department of Clinical Neuroscience at St. Göran, Karolinska Institutet, Stockholm, Sweden

Mikael Landén

Affiliations Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden, Institute of Neuroscience and Physiology, The Sahlgrenska Academy at Gothenburg University, Gothenburg, Sweden

Competing Interests

None of the funding sources of the authors were involved in the preparation of or decision to submit this manuscript. One of the authors (Rolf Nybom) is the inventor and patent owner of the special airtight device of the polycarbonate filters from Sempore®, Sweden used in this study, Patent No 9601247-1. The authors also confirm that this does not alter their adherence to all the PLOS ONE policies on sharing data and materials as detailed in the guide for authors. The patent is concerning 20 specifications which allow filtered material to concentrate to a small area in the middle of the filter. A figure of the filter device is included in the patent information: http://www.prv.se/spd/patent?lang=en&hits=true&hitsstart=0&tab=1&content=RolfNybom&p2=S7YKcsVxazY%3D&p1=QhSDGVkcNSd7eM42P9NdVA%3D%3D&start=4.

Author Contributions

Conceived and designed the experiments: VJ RN LW CMH TC AGJ CJE ML. Performed the experiments: VJ RN LW CMH AGJ CJE ML. Analyzed the data: VJ TC CMH LW ML. Contributed reagents/materials/analysis tools: RN LW ML. Wrote the paper: VJ TC CMH LW ML.