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Hak E, Hermens RP, Hoes AW, Verheij TJ, Kuyvenhoven MM, van Essen GA.Hak E, et al.Scand J Prim Health Care. 2000 Dec;18(4):237-41. doi: 10.1080/028134300448814.Scand J Prim Health Care. 2000.PMID: 11205093Free article.Clinical Trial.
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Jansen AG, Sanders EA, Schilder AG, Hoes AW, de Jong VF, Hak E.Jansen AG, et al. Among authors: hak e.Scand J Prim Health Care. 2006 Dec;24(4):231-6. doi: 10.1080/02813430600830469.Scand J Prim Health Care. 2006.PMID: 17118863Free article.
Hak E, Hermens RP, van Essen GA, Kuyvenhoven MM, de Melker RA.Hak E, et al.Br J Gen Pract. 1997 Jun;47(419):363-6.Br J Gen Pract. 1997.PMID: 9231470Free PMC article.
Hak E, van Essen GA, Buskens E, Stalman W, de Melker RA.Hak E, et al.J Epidemiol Community Health. 1998 Feb;52(2):120-5. doi: 10.1136/jech.52.2.120.J Epidemiol Community Health. 1998.PMID: 9578860Free PMC article.
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.
Opstelten W, Hak E, Verheij TJ, van Essen GA.Opstelten W, et al. Among authors: hak e.Am J Med. 2001 Oct 15;111(6):474-9. doi: 10.1016/s0002-9343(01)00880-4.Am J Med. 2001.PMID: 11690574
Smits AJ, Hak E, Stalman WA, van Essen GA, Hoes AW, Verheij TJ.Smits AJ, et al. Among authors: hak e.Epidemiol Infect. 2002 Apr;128(2):205-11. doi: 10.1017/s0950268801006574.Epidemiol Infect. 2002.PMID: 12002538Free PMC article.
Hak E, Verheij TJ, Grobbee DE, Nichol KL, Hoes AW.Hak E, et al.J Epidemiol Community Health. 2002 Dec;56(12):951-5. doi: 10.1136/jech.56.12.951.J Epidemiol Community Health. 2002.PMID: 12461118Free PMC article.Review.