Impact of radiotherapy for head and neck cancer on obstructive sleep apnea: a prospective study - Inoshita, Ayako; Sata, Naoko; Ohba, Shinichi; Suzuki, Yo; Ito, Shin; Shiroshita, Nanako; Kawana, Fusae; Kasai, Takatoshi; Higo, Ryuzaburo; Ikeda, Katsuhisa; Matsumoto, Fumihiko (Annals of Palliative Medicine, 2022)