Platelet unresponsiveness to collagen: involvement of glycoprotein Ia-IIa (alpha 2 beta 1 integrin) deficiency associated with a myeloproliferative disorder - Handa, M; Watanabe, K; Kawai, Y; Kamata, T; Koyama, T; Nagai, H; Ikeda, Y (Thromb Haemost, 1995)