MTHFR allele and one-carbon metabolic profile predict severity of COVID-19 - Boryana Petrova; Caitlin Syphurs; Andrew J. Culhane; Jing Chen; Ernie Chen; Chris Cotsapas; Denise Esserman; Ruth R. Montgomery; Steven H. Kleinstein; Kinga K. Smolen; Kevin Mendez; Jessica Lasky-Su; et al. (Proceedings of the National Academy of Sciences, 2025)