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- karger5
- karger ag3
- bmj publishing group2
- british medical association2
- elsevier1
- elsevier bv:po box 211, 1000 ae amsterdam netherlands:011 31 20 4853757, 011 31 20 4853642, 011 31 20 4853641, email: nlinfo-f@elsevier.nl, internet: http://www.elsevier.nl, fax: 011 31 20 48535981
- elsevier sas1
- georg thieme verlag stuttgart1
- hippokrates verlag1