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A handheld 2 MHz ultrasound Doppler device determines the presence or absence of pulsatile arterial flow immediately beneath the selected site of entry for dermal filler injection. In combination with near infrared technology to map out superficial veins, mishaps from intravascular injections may be reduced. A total of 448 patients aged range between 21 and 74 years, with 168 out of total of 1019...
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