Accepted for Publication: May 7, 2012.
Published Online: October 15, 2012. doi:10.1001/archpediatrics.2012.1383
Author Contributions:Study concept and design: Hannula, Venhola, Pokka, and Uhari. Acquisition of data: Hannula, Perhomaa, and Uhari. Analysis and interpretation of data: Hannula, Perhomaa, Venhola, Pokka, Renko, and Uhari. Drafting of the manuscript: Hannula, Perhomaa, Venhola, Pokka, and Uhari. Critical revision of the manuscript for important intellectual content: Hannula, Perhomaa, Venhola, Pokka, Renko, and Uhari. Statistical analysis: Hannula, Pokka, and Uhari. Obtained funding: Hannula. Administrative, technical, and material support: Perhomaa, Pokka, and Uhari. Study supervision: Perhomaa, Venhola, Renko, and Uhari.
Financial Disclosure: None reported.
Funding/Support: This study was supported in part by grants from the Alma and K. A. Snellman Foundation, the Maud Kuistila Memorial Foundation, the Kidney Foundation, the Foundation for Paediatric Research, and Oulu University Hospital.
Online-Only Material: This article is featured in the Archives Journal Club. Go to here to download teaching PowerPoint slides.