PMID: 18840471 [PubMed - in process]
PMID: 18690014 [PubMed - as supplied by publisher]
PMID: 18358544 [PubMed - indexed for MEDLINE]
PMID: 16430975 [PubMed - indexed for MEDLINE]
PMID: 14618278 [PubMed - indexed for MEDLINE]
PMID: 10415059 [PubMed - indexed for MEDLINE]
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