Interim findings from first-dose mass COVID-19 vaccination roll-out and COVID-19 hospital admissions in Scotland: a national prospective cohort study by Vasileiou, E, Simpson, CR, Shi, T, Kerr, S, Agrawal, U, Akbari, A, Bedston, S, Beggs, J, Bradley, D, Chuter, A, de Lusignan, S, Docherty, AB, Hobbs, F, Joy, M, Katikireddi, SV, Marple, J, McCowan, C, McGagh, D, McMenamin, J, Moore, E, Murray, J-LK, Pan, J, Ritchie, L, Shah, SA, Stock, S, Torabi, F, Tsang, R, Wood, R, Woolhouse, M, Roberton, C, Sheikh, A