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The 6 references without a DOI — listed, not checked
no DOI — not checkedIngestible, controllable, and degradable origami robot for patching stomach wounds
no DOI — not checkedRobotic metamorphosis by origami exoskeletons
no DOI — not checkedOral, ultralong-lasting drug delivery: Application toward malaria elimination goals
no DOI — not checkedUtility of fibrin glue in therapeutic endoscopy
no DOI — not checkedA light-reflecting balloon catheter for atraumatic tissue defect repair
no DOI — not checkedSurgical materials: Current challenges and nano-enabled solutions
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