Vinceti M, Filippini T, Rothman KJ, Di Federico S, Orsini N. The association between first and second wave COVID-19 mortality in Italy. BMC Public Health. 2021 Nov 11;21(1):2069. doi: 10.1186/s12889-021-12126-4
Ehrenstein V, Sorensen HT, Pedersen L, Larsen H, Holsteen V, Rothman KJ. Apgar score and hospitalization for epilepsy in childhood: a registry-based cohort study. BMC Public Health. 2006 Feb 1;6:23.