PMID: 18058423 [PubMed - indexed for MEDLINE]
Am J Public Health. 2004 Feb; 94(2):261-3.
[Am J Public Health. 2004]
Lancet. 2003 Jul 26; 362(9380):258-9.
[Lancet. 2003]
Chest. 2006 Feb; 129(2):495; author reply 495-6.
[Chest. 2006]
Pediatrics. 2005 Dec; 116(6):1516-28.
[Pediatrics. 2005]
Adolesc Med Clin. 2005 Jun; 16(2):345-70, ix.
[Adolesc Med Clin. 2005]
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