Balloon Eustachian tuboplasty for obstructive Eustachian tube dysfunction: retrospective multicentre cohort study of 248 patients - Sandoval, Marta; Navarro, Juan-J; Martinez-Beneyto, Paz; Herrera, Mayte; Alfaro, Jorge; Lopez, Felipe; Marco, Jaime; Plaza, Guillermo (European Archives Of Oto-Rhino-Laryngology, 2023)