REFILE - CORRECTING TYPO IN SURNAMEDmitry Stolyarov, a heart surgeon, holds a stent, which is inserted into constricted coronary arteries to help keep them open and normalise blood flow, as he performs a surgery on a patient with a blood clot in the carotid artery at the Federal Center of Cardiovascular Surgery in the Siberian city of Krasnoyarsk, Russia, September 28, 2016. Picture taken September 28, 2016. REUTERS/Ilya Naymushin