Evaluation of the accuracy of a low-cost external tocodynamometer in a pilot study in Malawi - Alex Kortum; Christina Samuel; Theresa Sonka; Lisette Tanner; Benjamin J.F. Huntley; Ahmed Abouseif; Z. Maria Oden; Richard A. Schwarz; Jennifer Carns; Suneet P. Chauhan; Phylos Bonongwe; Rebecca Richards-Kortum (PLoS ONE, 2025)