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Maschewsky-Schneider U, Greiser E, Helmert U.Maschewsky-Schneider U, et al. Among authors: helmert u.Soz Praventivmed. 1988;33(3):173-80. doi: 10.1007/BF02078426.Soz Praventivmed. 1988.PMID: 3213237German.
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Helmert U, Herman B, Joeckel KH, Greiser E, Madans J.Helmert U, et al.J Epidemiol Community Health. 1989 Mar;43(1):37-42. doi: 10.1136/jech.43.1.37.J Epidemiol Community Health. 1989.PMID: 2592889Free PMC article.
Bronder E, Klimpel A, Helmert U, Greiser E, Molzahn M, Pommer W.Bronder E, et al. Among authors: helmert u.Soz Praventivmed. 1999;44(3):117-25. doi: 10.1007/BF01299400.Soz Praventivmed. 1999.PMID: 10436491German.
Heinemann L, Helmert U, Classen E, Greiser E.Heinemann L, et al. Among authors: helmert u.Rev Environ Health. 1996 Jan-Jun;11(1-2):7-14. doi: 10.1515/REVEH.1996.11.1-2.7.Rev Environ Health. 1996.PMID: 8869521
Helmert U, Herman B, Klesse R, Greiser E.Helmert U, et al.Offentl Gesundheitswes. 1987 Dec;49(12):621-7.Offentl Gesundheitswes. 1987.PMID: 2963977German.No abstract available.