.Publisheru00e2 $ s note Springer Nature continues to be neutral for administrative claims in released charts as well as institutional affiliations.This is a conclusion of: Hanson, C. et al. A time-stratified, caseu00e2 $ "crossover study of warm direct exposure as well as perinatal mortality from 16 healthcare facilities in sub-Saharan Africa. Nat. Med. https://doi.org/10.1038/s41591-024-03245-7 (2024 ).