RT Journal Article SR Electronic T1 Safe surfaces JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP e131 OP e132 DO 10.7861/clinmed.Let.20.4.2 VO 20 IS 4 A1 Leo R Brown YR 2020 UL http://www.rcpjournals.org/content/20/4/e131.2.abstract