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Velthuis AG, DE Jong MC, Stockhofe N, Vermeulen TM, Kamp EM.Velthuis AG, et al. Among authors: kamp em.Epidemiol Infect. 2002 Aug;129(1):203-14. doi: 10.1017/s0950268802007252.Epidemiol Infect. 2002.PMID: 12211589Free PMC article.
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Kamp EM, Bokken GC, Vermeulen TM, de Jong MF, Buys HE, Reek FH, Smits MA.Kamp EM, et al.J Vet Diagn Invest. 1996 Jul;8(3):304-9. doi: 10.1177/104063879600800305.J Vet Diagn Invest. 1996.PMID: 8844572