1. How and When to Take Prostate Biopsies
Jan Vanderkerken, Jean de la Rosette, Pilar Laguna, Frans Debruyne 
European Urology Supplements 
Volume 1, Issue 6, Pages (September 2002)
DOI: /S (02)

2. Fig. 1
Difference between echogenicity of the peripheral zone and the transition zone.
European Urology Supplements 2002 1, 15-20DOI: ( /S (02) )

3. Fig. 2
A large tumor can be missed if the biopsy-needle is not directed into the peripheral zone.
European Urology Supplements 2002 1, 15-20DOI: ( /S (02) )