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. 2024 Nov 28;24:801. doi: 10.1186/s12884-024-06962-6

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© The Author(s) 2024

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Fig. 3 — Spectral Doppler demonstrating two different arterial heart rates with opposite blood flow directions (A) and simultaneous counter-arterial blood flow directions (B) at the point of entangled cords (white and yellow arrows)