Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) SPIEGEL AM,Intrathyroidal parathyroid adenoma or hyperplasia. An occasional overlooked cause of surgical failure in primary hyperparathyroidism,JAMA,,,1975,234,,1029-1033,https://cir.nii.ac.jp/crid/1570291226238011520,https://doi.org/10.1001/jama.234.10.1029