Kwong, A., Pearson, R., Adams, M., Northstone, K., Tilling, K., Smith, D., Fawns-Ritchie, C., Bould, H., Warne, N., Zammit, S., Gunnell, D., Moran, P., Micali, N., Reichenberg, A., Hickman, M., Rai, D., Haworth, S., Campbell, A., Altschul, D., Flaig, R., McIntosh, A., Lawlor, D., Porteous, D. & Timpson, N. 2020, 'Mental health before and during COVID-19 in two longitudinal UK population cohorts', The British Journal of Psychiatry., 218(6), pp. 334-343. https://doi.org/10.1192/bjp.2020.242