Effects of s-ketamine and midazolam on respiratory variability: A randomized controlled pilot trial - Oscar F. C. van den Bosch; Johan P. A. van Lennep; Ricardo Alvarez-Jimenez; Henriët van Middendorp; Andrea W. M. Evers; Monique A. H. Steegers; Patrick Schober; Stephan A. Loer (PLoS ONE, 2025)