Schmidt, M. C., Kahraman, D., Neumaier, B., Ortmann, M., & Stippel, D. (2011). Tc-99m-MIBI-negative parathyroid adenoma in primary hyperparathyroidism detected by C-11-methionine PET/CT after previous thyroid surgery. Clinical Nuclear Medicine, 36(12), 1153-1155. doi:10.1097/RLU.0b013e31823360ee.