RT Journal Article SR Electronic T1 Revalidation – half-time score JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 307 OP 308 DO 10.7861/clinmedicine.16-4-307 VO 16 IS 4 A1 Humphrey Hodgson YR 2016 UL http://www.rcpjournals.org/content/16/4/307.abstract