Early manifestation of calcinosis cutis in pseudohypoparathyroidism type Ia associated with a novel mutation in the GNAS gene - Riepe, F G; Ahrens, W; Krone, N; Folster-Holst, R; Brasch, J; Sippell, W G; Hiort, O; Partsch, C J (Eur J Endocrinol, 2005)