Long-term follow-up of patients with obstructed sleep apnea treated with uvulopalatopharyngoplasty. - Janson,C.; Gislason,T.; Bengtsson,H.; Eriksson,G.; Lindberg,E.; Lindholm,C.E.; Hultcrantz,E.; Hetta,J.; Boman,B. (Arch Otolaryngol Head Neck Surg, 1997)