- Correspondence to Dr Jefferson P Piva, Pediatric Intensive Care, Unit H, São Lucas-PUCRS, Av. Ipiranga 6690 – 5 andar, CEP – 90.610-000, Porto Alegre (RS), Brazil;
- Received December 17, 2009
- Revised February 3, 2010
- Accepted February 8, 2010
- First published May 3, 2010.
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