RT Journal Article SR Electronic T1 Persistent fatigue in patients with COVID-19 JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP e117 OP e117 DO 10.7861/clinmed.Let.21.1.3 VO 21 IS 1 A1 Chia Siang Kow A1 Syed Shahzad Hasan YR 2021 UL http://www.rcpjournals.org/content/21/1/e117.abstract