TY - RPRT TI - The Björk-Shiley mitral valve prosthesis. A comparative study with different prosthesis orientations. AU - V O Björk AU - K Böök AU - A Holmgren PY - 1974 DO - 10.1016/s0003-4975(10)64375-5 UR - https://pubmed.ncbi.nlm.nih.gov/4425502/ ID - 4425502 ER -