Evaluating a digital hybrid training-of-trainers (TOT) approach for lay first responder trauma education in urban Nigeria during the COVID-19 pandemic by Eisner, ZJ, Delaney, PG, Achunine, P, Kulkarni, A, Shaida, F, Smith, N, Onabanjo, S, Popoola, A, Pine, H, Sun, J, Klapow, MC, Raghavendran, K