Correction: Estimating the propagation of both reported and undocumented COVID-19 cases in Spain: a panel data frontier approximation of epidemiological models (Journal of Productivity Analysis, (2023), 59, 3, (259-279), 10.1007/s11123-023-00664-5)

1. Álvarez, I.C.
2. Orea, L.
3. Wall, A.