Areerak, Kantheera, Chavapon Pupapassiri, Wattana Jalayondeja, Pirun Nanta, and Ruttana Phetsitong. 2026. “The effect of breath-holding and Valsalva manoeuvre on pain: a systematic review and meta-analysis”. Archives of Allied Health Sciences 38 (2). Khon Kaen, Thailand:47-65. https://he01.tci-thaijo.org/index.php/ams/article/view/286591.