Disruption of oxygen homeostasis underlies congenital Chuvash polycythemia. af Ang, S, Chen, H, Hirota, K, Gordeuk, V, Jelinek, J, Guan, Y, Liu, E, Sergueeva, A, Miasnikova, G, Mole, D, Maxwell, P, Stockton, D, Semenza, G, Prchal, J