Differences in the Asymmetry of Beat-to-Beat Fetal Heart Rate Accelerations and Decelerations at Preterm and Term Active Labor. - Carolina López-Justo; Adriana Cristina Pliego-Carrillo; Claudia Ivette Ledesma-Ramírez; Hugo Mendieta-Zerón; Miguel Ángel Peña-Castillo; Juan Carlos Echeverría; Jorge Rodríguez Arce; José Javier Reyes-Lagos (Sensors, 2021)