TY CONF TI Thoracoscopic upper thoracic sympathectomy in the treatment of patients with compression and mechanical injuries of the peripheral nerves of the upper extremity KW thoracoscopy KW microsurgery KW nerve injuries KW revascularization KW sympathectomy JO The 2nd Scientific and Practical Symposium named after Professor Boris Semenovich Dobryakov "Creative Heritage in Medicine" with international participation AU Kozlov, A.V. PY 2026 PB NROO SITO "Living Atmosphere"