PT - JOURNAL ARTICLE AU - David Nanchen TI - Resting heart rate: what is normal? AID - 10.1136/heartjnl-2017-312731 DP - 2018 Jan 30 TA - Heart PG - heartjnl-2017-312731 4099 - http://heart.bmj.com/content/early/2018/01/30/heartjnl-2017-312731.short 4100 - http://heart.bmj.com/content/early/2018/01/30/heartjnl-2017-312731.full