Impact of SARS-CoV-2 variant on the severity of maternal infection and perinatal outcomes: Data from the UK Obstetric Surveillance System national cohort
Published in 2021 by
Nicola Vousden,
Rema Ramakrishnan,
Kathryn Bunch,
Edward Morris,
Nigel Simpson,
Christopher Gale,
Patrick O’Brien,
Maria Quigley,
Peter Brocklehurst,
Jennifer J. Kurinczuk 
,
Marian Knight
,
Marian Knight
