OxVent: Design and evaluation of a rapidly-manufactured Covid-19 ventilator by Beale, R, Rosendo, JB, Bergeles, C, Beverly, A, Camporota, L, Castrejón-Pita, AA, Crockett, DC, Cronin, JN, Denison, T, East, S, Edwardes, C, Farmery, AD, Fele, F, Fisk, J, Fuenteslópez, CV, Garstka, M, Goulart, P, Heaysman, C, Hussain, A, Jha, P, Kempf, I, Kumar, AS, Möslein, A, Orr, ACJ, Ourselin, S, Salisbury, D, Seneci, C, Staruch, R, Steel, H, Thompson, M, Tran, MC, Vitiello, V, Xochicale, M, Zhou, F, Formenti, F, Kirk, T