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Ruiz JR, Ortega FB, Rizzo NS, Villa I, Hurtig-Wennlöf A, Oja L, Sjöström M.Ruiz JR, et al. Among authors: ortega fb.Pediatr Res. 2007 Mar;61(3):350-5. doi: 10.1203/pdr.0b013e318030d1bd.Pediatr Res. 2007.PMID: 17314696