Two-dimensional Doppler echocardiographic assessment of closure of the ductus arteriosus in normal newborn infants von Hiraishi, Satoshi, Misawa, Hitoshi, Oguchi, Kohki, Kadoi, Nobuaki, Saito, Koichi, Fujino, Nobuyuki, Hojo, Midori, Horiguchi, Yasunori, Yashiro, Kimio

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