We are grateful to the reviewers listed below for their invaluable contributions of detailed reviews and constructive comments in improving many manuscripts submitted to this journal during 2011 of Volume 4, Nos. 1 and 2.

Hidetaka Arimura

Masahiro Endo

Keisuke Fujii

Tatsuya Fujisaki

Eun Young Han

Hideaki Haneishi

Takanori Hara

Masafumi Harada

Yoshinori Hayakawa

Naoki Hayashi

Yoshiharu Higashida

Masao Hoshina

Katsuhiro Ichikawa

Ryuji Ikeda

Hiroshi Imai

Takayuki Ishida

Yoshiyuki Ishimori

Kunihiro Iwata

Akiko Kano

Kenichi Kashikura

Ikuo Kawashita

Masanori Komi

Kichiro Koshida

Shuji Koyama

Hitoshi Kubo

Naoki Kubo

Ichiei Kuji

Motoki Kumagai

Seiji Kumazawa

Kagayaki Kuroda

Yoshio Machida

Kosuke Matsubara

Tomoko Matsubara

Masao Matsumoto

Kotaro Minato

Tosiaki Miyati

Shinichiro Mori

Junji Morishita

Nobutoku Motomura

Hiroyuki Nagashima

Takashi Obi

Keiichi Oda

Koichi Ogawa

Toshihiro Ogura

Hideo Onishi

Shuichi Ozawa

Yasuo Sasaki

Koji Sasaki

Masaru Sekiya

Gregory Sharp

Masayuki Shimosegawa

Norimitsu Shinohara

Junji Shiraishi

Iori Sumida

Katsuyosi Tabushi

Yoshihisa Takada

Junji Takahashi

Rie Tanaka

Kunihiko Tateoka

Atsushi Teramoto

Kenji Tokumori

Nobuhiro Tsukamoto

Yoshikazu Uchiyama

Tokuo Umeda

Hiroshi Watabe

Ichiro Yamaguchi

Toru Yamamoto

Seiichi Yamamoto

Hideo Yasunaga

Shigeru Yokoyama

Shunsuke Yonai

Kunio Doi, Ph.D., Editor-in-Chief