About the Authors

Martha Á. Hjálmarsdóttir

Contributed equally to this work with: Martha Á. Hjálmarsdóttir, Sigríður Júlía Quirk

hjalmars@hi.is

Affiliations Department of Clinical Microbiology, Landspitali University Hospital, Reykjavik, Iceland, Faculty of Medicine, University of Iceland, Reykjavik, Iceland, BioMedical Center of the University of Iceland, Reykjavik, Iceland

Sigríður Júlía Quirk

Contributed equally to this work with: Martha Á. Hjálmarsdóttir, Sigríður Júlía Quirk

Affiliations Department of Clinical Microbiology, Landspitali University Hospital, Reykjavik, Iceland, Faculty of Medicine, University of Iceland, Reykjavik, Iceland, BioMedical Center of the University of Iceland, Reykjavik, Iceland

Gunnsteinn Haraldsson

Affiliations Department of Clinical Microbiology, Landspitali University Hospital, Reykjavik, Iceland, Faculty of Medicine, University of Iceland, Reykjavik, Iceland, BioMedical Center of the University of Iceland, Reykjavik, Iceland

Helga Erlendsdóttir

Affiliations Department of Clinical Microbiology, Landspitali University Hospital, Reykjavik, Iceland, Faculty of Medicine, University of Iceland, Reykjavik, Iceland, BioMedical Center of the University of Iceland, Reykjavik, Iceland

Ásgeir Haraldsson

Affiliations Faculty of Medicine, University of Iceland, Reykjavik, Iceland, Children's Hospital, Landspitali University Hospital, Reykjavik, Iceland

Karl G. Kristinsson

Affiliations Department of Clinical Microbiology, Landspitali University Hospital, Reykjavik, Iceland, Faculty of Medicine, University of Iceland, Reykjavik, Iceland, BioMedical Center of the University of Iceland, Reykjavik, Iceland

Competing Interests

Some of the authors (HE, ÁH and KGK) have received a research grant from GSK, to study the effectiveness of pneumococcal vaccination in Iceland. That study is an investigator initiated study with no conflicting interests related to the current study. GSK did not fund this specific study. There are no patents, products in development or marketed products to declare. This does not alter our adherence to PLOS ONE policies on sharing data and materials.

Author Contributions

Conceptualization: MÁH KGK. Data curation: MÁH SJQ. Formal analysis: MÁH SJQ GH HE ÁH KGK. Funding acquisition: MÁH KGK. Investigation: SJQ GH MÁH. Methodology: MÁH GH SJQ. Project administration: MÁH KGK. Resources: MH KGK. Supervision: MÁH KGK. Validation: MÁH GH. Visualization: MAH. Writing – original draft: MÁH SJQ. Writing – review & editing: MÁH KGK GH HE ÁH.