RT Journal Article SR Electronic T1 Procalcitonin for patient stratification and identification of bacterial co-infection in COVID-19 JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP e47 OP e47 DO 10.7861/clinmed.Let.20.3.3 VO 20 IS 3 A1 Jennie Han A1 Timothy Gatheral A1 Craig Williams YR 2020 UL http://www.rcpjournals.org/content/20/3/e47.abstract