(AFRICAN EXAMINER) - Renowned Professor of Cardiology and Vascular surgery at the University of Nigeria, Nsukka (UNN), Prof. Ndubueze Ezemba has been appointed chairman of the university of Nigeria Hospital, UNTH, Cardiothoracic Centre of Excellence. A statement from the chief medical director (CMD) of the University of Nigeria Teaching Hospital UNTH, Ituku-Ozalla, Enugu State, Prof.