Effect of real-time visual feedback device ‘Quality Cardiopulmonary Resuscitation (QCPR) Classroom’ with a metronome sound on layperson CPR training in Japan: a cluster randomized... oleh Shota Tanaka, Kyoko Tsukigase, Takahiro Hara, Ryo Sagisaka, Helge Myklebust, Tonje Soraas Birkenes, Ayana Iwata, Yutaro Kidokoro, Momoyo Yamada, Hiroki Ueta, Hiroshi Takyu, Hideharu Tanaka