Head-to-head comparison of [¹¹C]methionine PET, [¹¹C]choline PET, and 4-dimensional CT as second-line scans for detection of parathyroid adenomas in primary hyperparathyroidism.

"Declarations Ethics approvalThe study was registered at the Netherlands Trial Register (NTR7423) and approved by the Research Ethics Board of the University Medical Center Groningen, The Netherlands (METc 2018/330). This study was performed in line with the principles of the Declaration of Helsinki. Written informed consent was obtained from all subjects. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding This research has received funding from the Foundation de Cock-Hadders (project number 2019–51)."

"The study was registered at the Netherlands Trial Register (NTR7423) and approved by the Research Ethics Board of the University Medical Center Groningen, The Netherlands (METc 2018/330). This study was performed in line with the principles of the Declaration of Helsinki. Written informed consent was obtained from all subjects. Declarations: Ethics approvalThe study was registered at the Netherlands Trial Register (NTR7423) and approved by the Research Ethics Board of the University Medical Center Groningen, The Netherlands (METc 2018/330). This study was performed in line with the principles of the Declaration of Helsinki. Written informed consent was obtained from all subjects.: Competing interestsThe authors declare no competing interests. Ethics approval: The study was registered at the Netherlands Trial Register (NTR7423) and approved by the Research Ethics Board of the University Medical Center Groningen, The Netherlands (METc 2018/330). This study was performed in line with the principles of the Declaration of Helsinki. Written informed consent was obtained from all subjects."