Research cooperation of the member countries of the Council for Mutual Economic Assistance in surgical treatment of cardiovascular diseases.
D000800:Angioplasty, Balloon; D001243:Assisted Circulation; D002318:Cardiovascular Diseases / Q000601:surgery*; D003327:Coronary Disease / Q000601:surgery; D005061:Europe, Eastern; D006302:Health Services Research / Q000639:trends*; D006330:Heart Defects, Congenital / Q000601:surgery; D006350:Heart Valve Prosthesis; D006801:Humans; D007391:International Cooperation