PMID: 16438816 [PubMed - indexed for MEDLINE]
PMCID: PMC1821422
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[Br J Gen Pract. 2005]
Servir. 2002 Sep-Oct; 50(5):244-6.
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Tidsskr Nor Laegeforen. 2008 Feb 14; 128(4):443-5.
[Tidsskr Nor Laegeforen. 2008]
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[Cochrane Database Syst Rev. 2007]
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[Orv Hetil. 2009]
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