MRI was performed with a Magnetom Avanto fit 1.5 T system from Siemens and an 18-channel body coil. Magtrace® (Endomagnetics Ltd, London, UK) was used as SPIO tracer and is a black-brownish sterile aqueous suspension consisting of carboxydextran-coated particles with a particle size of 60 nm. Magtrace® contains circa 28 mg iron per ml and is intended for subcutaneous use [16 (link), 20 , 21 ].
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