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Ultrasound image of the injection process of the in situ formation of chitosan and chitosan-hydroxyapatite hydrogels. A Subcutaneous injection of the hydrogel under ultrasound transducer. B Monitoring of the injected ultrasound (arrow indicated the syringe needle). This image was taken from the Journal of Nanomaterials [59] copyright © 2012, Yan Chen et al.
