Serum IGF-I is not a reliable pharmacodynamic marker of exogenous growth hormone activity in mice - Bielohuby, M; Schaab, M; Kummann, M; Sawitzky, M; Gebhardt, R; Binder, G; Frystyk, J; Bjerre, M; Hoeflich, A; Kratzsch, J; Bidlingmaier, M (Endocrinology, 2011)