flow imaging', 'laser flow Doppler', 'venous plethysmography', 'cardi* magnetic resonance imaging', 'aortic intima-media thickness' (aIMT), 'vascular ultrasound' and 'neonat*', 'paediatric', 'infant*', 'child*'. Case reports, case series, reviews, commentaries, conference proceedings, animal studies, articles not in English and articles with children >12 years were
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