A sensitive sandwich ELISA for measuring thrombopoietin in human serum: Serum thrombopoietin levels in healthy volunteers and in patients with hematopoietic disorder - Tahara, T; Usuki, K; Sato, H; Ohashi, H; Morita, H; Tsumura, H; Matsumoto, A; Miyazaki, H; Urabe, A; Kato, T (Brit J Haematol, 1996)