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- springer science and business media llc15
- wiley9
- elsevier bv3
- ovid technologies (wolters kluwer health)2
- sage publications2
- springer verlag germany:tiergartenstrasse 17, d 69121 heidelberg germany:011 49 6221 3450, email: g.braun@springer.de, internet: http://www.springer.de, fax: 011 49 6221 3452292
- blackwell science inc1
- edra1
- elsevier srl1