Preface

Testosterone, the hormone that turns males into men, has enjoyed continually growing interest among clinicians and scientists and has gained public attention over the past decades. This heightened interest is matched by a similarly increasing body of research and knowledge about male physiology and testosterone's biological and molecular action, about clinical symptoms and syndromes caused by testosterone deficiency and about the modalities for its use. The number of preparations available for clinical use has also multiplied impressively over recent years.

Proper diagnosis and treatment of testosterone deficiency require a profound understanding of the underlying science. The editors and authors have distilled current knowledge about action, deficiency and substitution oftestosterone into this volume which follows two previous editions (1990 and 1998). Commensurate with the expanding knowledge about testosterone the current third edition has grown substantially in volume. Some previous chapters have been completely rewritten, some were combined and condensed in order to make room for new topics.

In order to synchronize the writing of the various chapters the editors and authors met at Castle Elmau in the splendid isolation of the Bavarian Alps at the end of September 2003 for final editing of the manuscripts previously submitted. This guaranteed that all chapters were concluded simultaneously and precisely reflect the current state of knowledge. This coordinated effort of all contributors ensures a long half-life of this book as an up-to-date reference source.

Peter Silver from Cambridge University Press encouraged this book project and we appreciate his help. We wish to thank the authors of the various chapters for their excellent compliance and timely submission of manuscripts. Our thanks go to Maria Schalkowski and Jasmin Oenning, our secretaries, who processed the manuscripts expediently. Futher thanks to Anne Olerink and Joachim Esselmann who dedicated their efforts to organizing a memorable meeting at Castle Elmau. Finally, the project and the meeting would not have been possible without the greatly appreciated financial support from Deutsche Forschungsgemeinschaft (DFG), Schering AG, Dr Kade / Besins Pharma GmbH, Dr August Wolff GmbH & Co., Ferring Arzneimittel GmbH, Jenapharm GmbH, and Organon GmbH.

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