Yutaka Ono
, Shuichi Awata
, Hideharu Iida
, Yasushi Ishida
, Naoki Ishizuka
, Hiroto Iwasa
, Yuichi Kamei
, Yutaka Motohashi
, Atsuo Nakagawa
, Jun Nakamura
, Nobuyuki Nishi
, Kotaro Otsuka
, Hirofumi Oyama
, Akio Sakai
, Hironori Sakai
, Yuriko Suzuki
, Miyuki Tajima
, Eriko Tanaka
, Hidenori Uda
, Naohiro Yonemoto
, Toshihiko Yotsumoto
and Naoki Watanabe 
BMC Public Health 2008,
8:315doi:10.1186/1471-2458-8-315