Calcitonin measurement to detect medullary thyroid carcinoma in nodular goiter: German evidence-based consensus recommendation - Karges, Wolfram; Dralle, Henning; Raue, Friedhelm; Mann, K.; Reiners, C.; Grussendorf, M.; Hüfner, M.; Niederle, B.; Brabantn, G. (Experimental and clinical endocrinology & diabetes, 2004)