Daimon, M. ., Akaishi, M. ., Asanuma, T. ., Hashimoto, S. ., Izumi, C. ., Iwanaga, S. ., … Nakatani, S. . (2018). Guideline from Japanese Society of Echocardiography: 2018 focused update incorporated into Guidance for the Management and Maintenance of Echocardiography Equipment. Journal of Echocardiography. https://doi.org/10.1007/s12574-018-0370-z (Original work published 2018)