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Hak E, Rovers MM, Sachs AP, Stalman WA, Verheij TJ.Hak E, et al.Eur J Epidemiol. 2003;18(9):899-902. doi: 10.1023/a:1025674816487.Eur J Epidemiol. 2003.PMID: 14561050
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Hak E, Verheij TJ, van Essen GA, Lafeber AB, Grobbee DE, Hoes AW.Hak E, et al.Epidemiol Infect. 2001 Apr;126(2):261-8. doi: 10.1017/s0950268801005180.Epidemiol Infect. 2001.PMID: 11357897Free PMC article.
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