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Volume 12, Issue 5 (September 2010) 12, 623–625; 10.1038/aja.2010.96 Testosterone deficiency and treatment in older men: definition, treatment, pitfalls Michael Zitzmann Centre for Reproductive Medicine and Andrology/Clinical Andrology of the University Clinics, Domagkstr. 11, Muenster D-48149, Germany Correspondence: Prof. Michael Zitzmann, Michael.Zitzmann@ukmuenster.de
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