Kei Arai, Tsutomu Nishiyama, Noboru Hara*, Takashi Kasahara, Kazuhide Saito and Kota Takahashi
* Corresponding author: Noboru Hara harasho@med.niigata-u.ac.jp
BMC Urology 2013, 13:7 doi:10.1186/1471-2490-13-7