Hypoalgesic effects, safety, and feasibility of a 6-minute high-lung-volume static apnea intervention - Mendoza-Arranz, Cristian; Miravet-Mingo, Guillermo; Fierro-Marrero, Jose; Reina-Varona, Alvaro; Leon-Hernandez, Jose Vicente; Sagarribay-Villano, Asier; Garcia-del Arco, Hugo; De Asis-Fernandez, Francisco (Korean Journal of Pain, 2026)