Stock, S., McAllister, D., Vasileiou, E., Simpson, C., Stagg, H., Agrawal, U., McCowan, C., Hopkins, L., Donaghy, J., Ritchie, L., Robertson, C., Sheikh, A. & Wood, R. 2020, 'COVID-19 in Pregnancy in Scotland (COPS): protocol for an observational study using linked Scottish national data', BMJ Open, 10(11), article no: e042813. https://doi.org/10.1136/bmjopen-2020-042813