Benson L., Ljunghall S., Groth T., Falk H., Hvarfner A., Rastad J., Wide L., & Åkerström G. (1987). Optimal Discrimination of Mild Hyperparathyroidism with Total Serum Calcium, Ionized Calcium and Parathyroid Hormone Measurements. Upsala Journal of Medical Sciences, 92(2), 147-176. https://doi.org/10.3109/03009738709178686