PT - JOURNAL ARTICLE AU - J NOLAN AU - K A A FOX TI - Heart rate variability and cardiac failure AID - 10.1136/hrt.81.5.561 DP - 1999 May 01 TA - Heart PG - 561--562 VI - 81 IP - 5 4099 - http://heart.bmj.com/content/81/5/561.short 4100 - http://heart.bmj.com/content/81/5/561.full SO - Heart1999 May 01; 81