PMID [] PMID [] PMID [] PMID ['11875063'] PMID [] PMID [] PMID [] PMID [] PMID [] PMID ['14712925', '14750904'] PMID ['12485420'] PMID ['12485420'] PMID ['12485420'] PMID ['12485420'] PMID ['15860628'] PMID ['15860628'] PMID [] PMID [] PMID [] PMID [] PMID [] PMID [] PMID ['15560782'] PMID ['15560782'] PMID [] PMID [] PMID [] PMID ['15798197'] PMID ['15798197'] PMID [] PMID []