Moderate to severe portopulmonary hypertension: Important correlates with Doppler echocardiography in liver transplant candidates. Kim, W. R., Krowka, M. J., Plevak, D. J., Lee, J. H., Rettke, Frantz, R. F., Wiesner, R. H. W B SAUNDERS CO. 1998: 352A

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