Department of Orthopedic Trauma and Microsurgery;
the First Affiliated Hospital of Sun Yat-sen University;
nerve; regeneration; contralateral; C7; nerve; root; transfer; nerve; graft; brachial; plexus; avulsion; injury; direct; repair; human; acellular; nerve; allograft; shoulder; function; elbow; function; nerve; transfer; phrenic; nerve; accessary; nerve; neural; regeneration;