TY - JOUR AU - Johnson, J N; Ackerman, M J TI - QTc: how long is too long? JO - Br J Sports Med IS - 09 VL - 43 PY - 2009 DO - 10.1136/bjsm.2008.054734 L3 - PubMed-ID: 19734499 SP - 657 EP - 662 ER -