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Zauber, A. G.; Winawer, S. J.; Bishop, D. T.; Ho, M. N.; Gerdes, H.; and the National Polyp Study Workgroup Gastroenterology (1994)
Fein, J. S.; Zhang, Z. F.; Karpeh, M.; Kurtz, R. C. Gastroenterology (1994)
Penton, A.; Chen, Y.; Staehling-Hampton, K.; Wrana, J.; Attisano, L.; Massague, J.; Szidonya, J.; Hoffmann, F. M. Developmental Biology (1994)