.Publisheru00e2 $ s note Springer Attribute continues to be neutral with regard to managerial cases in released charts as well as institutional affiliations.This is a review of: Hanson, C. et al. A time-stratified, caseu00e2 $ "crossover study of warm visibility and also perinatal death from 16 medical facilities in sub-Saharan Africa. Nat. Med. https://doi.org/10.1038/s41591-024-03245-7 (2024 ).