The ageing and myasthenic thymus: a morphometric study validating a standard procedure in the histological workup of thymic specimens. by Ströbel, P, Moritz, R, Leite, M, Willcox, N, Chuang, W, Gold, R, Nix, W, Schalke, B, Kiefer, R, Müller-Hermelink, H, Jaretzki, A, Newsom-Davis, J, Marx, A