RT Journal Article SR Electronic T1 Sarcopenia, frailty and exercise JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 591 OP 591 DO 10.7861/clinmedicine.17-6-591 VO 17 IS 6 A1 Hugh JN Bethell YR 2017 UL http://www.rcpjournals.org/content/17/6/591.1.abstract