RT Journal Article SR Electronic T1 Introducing heart rate variability technology into the UK defence mild traumatic brain injury service JF BMJ Military Health JO BMJ Mil Health FD British Medical Journal Publishing Group SP e002113 DO 10.1136/bmjmilitary-2022-002113 A1 Andrew David Houston A1 H Brunger A1 T White A1 H Ellis A1 S Dharm-Datta A1 K Brockman A1 P Ladlow YR 2022 UL http://militaryhealth.bmj.com/content/early/2022/05/17/bmjmilitary-2022-002113.abstract AB