Nakaminato, S.; Toriihara, A.; Makino, T.; Kawano, T.; Kishimoto, S.; Shibuya, H. Prevalence of Esophageal Cancer During the Pretreatment of Hypopharyngeal Cancer Patients: Routinely Performed Esophagogastroduodenoscopy and FDG-PET CT Findings. AO 2012, 51, 645-652.