Trends and determinants of acute tocolysis implementation in Japan, 2012–2023: An 11-year nationwide retrospective cohort study - Mikayo Toba; Rie Oi; Mutsuko Moriwaki; Masayuki Kakehashi; Ayako Fudono; Kiyohide Fushimi; Naoyuki Miyasaka (PLoS ONE, 2026)