Blaabjerg , O., Elg , P., Gerhardt , W., Hellsing , K., Olafsdottir , E., Penttilä , I., Hyltoft Petersen , P., Steensland , H., & Uldall , A. (1993). 6.2.4 A Nordic Reference Serum Suitable for Use as Trueness Control in the Clinical Routine Laboratory. Upsala Journal of Medical Sciences, 98(3), 405-412. https://doi.org/10.3109/03009739309179340