Silje Pettersen, Ragnhild Sørum Falk, Siri Vangen, Lill Trine Nyfløt. "Tone or tissue? A comparison of trends and risk factors of severe postpartum hemorrhage according to uterine atony or retained tissue in a hospital setting." PLoS ONE (2025). https://doi.org/10.1371/journal.pone.0318770