We conducted this trial between November 2006 and March 2009 at the Children's Hospital of Pittsburgh and Armstrong Pediatrics, an affiliated private practice in Kittanning, Pennsylvania. The study protocol was approved by the institutional review board at the University of Pittsburgh; written informed consent was obtained from a parent of each enrolled child. The protocol, including the statistical analysis plan, is available with the full text of this article at NEJM.org. The authors attest that the study was performed in accordance with the protocol and the statistical analysis plan.
[英語から日本語への翻訳依頼] 2006年11月から2009年9月の間、ピッツバーグの小児病院とアームストロングの小児科、ペンシルバニア州キタニングの提携する個人病院にてこの実験を行いま...
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