Published Online: October 7, 2013. doi:10.1001/jamapediatrics.2013.2311.
Study concept and design: Tsubokura, Shibuya, Kato, Oikawa.
Acquisition of data: Tsubokura, Oikawa, Kanazawa.
Analysis and interpretation of data: Tsubokura, Shibuya, Oikawa, Kanazawa.
Drafting of the manuscript: Tsubokura, Shibuya, Kato.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Tsubokura, Shibuya.
Administrative, technical, or material support: Tsubokura, Oikawa, Kanazawa.
Study supervision: All authors.
Conflict of Interest Disclosures: None reported.
Additional Contributions: We thank Kyohei Takahashi, MD, Hara-machi Central Obstetrics and Gynecology Clinic, for invaluable efforts in the installation of the whole-body counter, Masahiro Kami, MD, PhD, The Institute of Medical Science, University of Tokyo, for the design and analysis of the study, Ryugo Hayano, PhD, Department of Physics, University of Tokyo, for the radiation physics review, and all measurement staff at Minamisoma Municipal General Hospital.