PT - JOURNAL ARTICLE AU - Otto, Catherine M TI - Heartbeat: Is biologic age best defined by exercise capacity? AID - 10.1136/heartjnl-2016-309463 DP - 2016 Mar 01 TA - Heart PG - 409--410 VI - 102 IP - 6 4099 - http://heart.bmj.com/content/102/6/409.short 4100 - http://heart.bmj.com/content/102/6/409.full SO - Heart2016 Mar 01; 102