Accepted for Publication: February 10, 2015.
Published Online: May 26, 2015. doi:10.1001/jamapediatrics.2015.0358.
Study concept and design: All authors.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Andersson, Lindquist, Hellström-Westas.
Critical revision of the manuscript for important intellectual content: Andersson, Lindgren, Stjernqvist, Domellöf, Hellström-Westas.
Statistical analysis: Andersson.
Obtained funding: Andersson, Hellström-Westas.
Administrative, technical, or material support: Andersson, Lindquist, Stjernqvist, Hellström-Westas.
Study supervision: Stjernqvist, Domellöf, Hellström-Westas.
Conflict of Interest Disclosures: None reported.
Funding/Support: This study was supported by grants from the Regional Scientific Council of Halland, the Linnéa and Josef Carlsson Foundation, the Southern Healthcare Region’s common funds for development and research, H. R. H. Crown Princess Lovisa's Society for Child Care, Uppsala University, the Little Childs foundation, Sweden, and the Swedish Research Council for Health, Working Life and Welfare (Dr Andersson).
Role of the Funder/Sponsor: The funding sources had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.
Additional Contributions: Eivor Kjellberg, RN, and Monika Nygren, RN, Department of Pediatrics, Hospital of Halland, Halmstad, provided assistance in collecting the data; both received wages for their work. Per-Erik Isberg, PhD, Department of Statistics, Lund University, and Maria Lönn, MSc, Maple Medical Science, provided statistical advice. Maple Medical Science is a statistical consulting company that was paid on a time-charge basis.