Hisao Hara , Taro Tsunoda , Naohiko Nemoto , Itaru Yokouchi , Masaya Yamamoto , Tsuyoshi Ono , Masao Moroi , Makoto Suzuki , Kaoru Sugi and Masato Nakamura
Cardiovascular Ultrasound 2008, 6:18doi:10.1186/1476-7120-6-18