[文献资料]参考文献

1．Tavel M．Cadiac auscultation：A glorious past‐but does it have a future，Circulation，1996，93：1250． 2．Perloff JK．Physical examination of the heart and circulation．3rd ed．Philadelphia：WB Saunders，2000：276‐282． 3．Shaver JA．Cadiac auscultation：A cost‐effetive ......