Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Maeda Emi and Mori Nozomu and Takebayashi Hironori and Tsuzuki Kenzo,A Case of Cholesterol Granuloma Caused by a Metal Foreign Body at the Tympanic Orifice of the Eustachian Tube,Practica Oto-Rhino-Laryngologica,00326313,The Society of Practical Otolaryngology,2023,116,7,647-652,https://cir.nii.ac.jp/crid/1390859616450592640,https://doi.org/10.5631/jibirin.116.647