aDivision of Clinical Medicine, School of Medicine and Population Health, University of Sheffield

bDepartment of Infectious Diseases, Sheffield Teaching Hospitals NHS Foundation Trust

cSheffield Trophoblastic Disease Centre, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, UK.

Correspondence to Victoria L. Parker, Division of Clinical Medicine, School of Medicine and Population Health, University of Sheffield, Level 4 Jessop Wing, Tree Root Walk, Sheffield, S10 2SF, UK. Tel: +44 114 215 9244; e-mail: [email protected]

Received 24 June, 2023

Revised 6 September, 2023

Accepted 21 September, 2023