Research BMJ 2026; 392 doi: https://doi.org/10.1136/bmj-2025-085725 Cite this as: BMJ 2026;392:e085725 Loreen Straub, instructor, Sonia Hernandez-Diaz, professor, Brian T Bateman, professor, Yanmin Zhu, assistant professor, Helen Mogun, analyst, Katherine L Wisner, professor, Kathryn J Gray, associate professor, Barry Lester, professor, Christopher J McDougle, professor, Page B Pennell, professor, Krista F Huybrechts, professor Author affiliations Correspondence to: L Straub...