AUTHOR=Sun Guanghao , Kurosawa Masaki , Ninomiya Yoshiki , Baba Kohei , Son Nguyen Huu , Yen Hoang Thi , Suzuki Satoshi , Kano Yutaka TITLE=Contactless monitoring of respiratory rate variability in rats under anesthesia with a compact 24GHz microwave radar sensor JOURNAL=Frontiers in Veterinary Science VOLUME=12 YEAR=2025 URL=https://www.frontiersin.org/journals/veterinary-science/articles/10.3389/fvets.2025.1518140 DOI=10.3389/fvets.2025.1518140 ISSN=2297-1769