PMID: 18420004 [PubMed - indexed for MEDLINE]
Ann Intern Med. 2007 Oct 16; 147(8):W163-94.
[Ann Intern Med. 2007]
Epidemiology. 2007 Nov; 18(6):805-35.
[Epidemiology. 2007]
PLoS Med. 2007 Oct 16; 4(10):e297.
[PLoS Med. 2007]
Gac Sanit. 2008 Mar-Apr; 22(2):144-50.
[Gac Sanit. 2008]
Rev Esp Salud Publica. 2008 May-Jun; 82(3):251-9.
[Rev Esp Salud Publica. 2008]
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