Smith Kathy, Brooks William, Challiner Jean, Povey Enid
South Central Ambulance Service NHS Foundation Trust, Bicester OX26 6HR, UK.
South Central Ambulance Service NHS Foundation Trust, Bicester OX26 6HR, UK.
Lancet. 2021 Nov 27;398(10315):1962. doi: 10.1016/S0140-6736(21)02328-X.