Editorial Office S. Karger Verlag für Medizin und Naturwissenschaften GmbH Dr. Sven Riestenpatt P.O. Box 79095 Freiburg (Germany) Tel. +49 761 45 20 722 Fax +49 761 45 20 714 s.riestenpatt@karger.de Customer Service S. Karger Verlag für Medizin und Naturwissenschaften GmbH P.O. Box 79095 Freiburg (Germany) Tel. +49 761 45207 0 Fax +49 761 45207-14 information@karger.de Helpdesk online@karger.ch Helpdesk for Subscribers   Journal Home Journal Content Guidelines Editorial Board Aims and Scope Subscriptions Journal Contacts Affiliations Advertising Congress Announcements Rights & Permissions Library Recommendation Alerts & RSS Online Sample Top 10 Articles Search in this journal For non-native English speakers and international authors who would like assistance with their writing before submission, we suggest American Journal Experts for their scientific editing service.  © 2009 S. Karger AG, Basel