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All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1964 and later revisions. Informed consent was obtained from all patients for being included in the study.
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Nishino, S., Watanabe, N., Nakama, T. et al. Direct measurement of coronary flow during a vasospastic angina attack by transthoracic Doppler echocardiography. J Echocardiogr 15, 88–90 (2017). https://doi.org/10.1007/s12574-016-0313-5
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DOI: https://doi.org/10.1007/s12574-016-0313-5