More Groups
Fewer Groups
More People
Fewer People
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Patz, E. F. Jr; Rusch, V. W.; Heelan, R. American Journal of Roentgenology (1996)
Schwartz, L. H.; Panicek, D. M.; Koutcher, J. A.; Heelan, R. T.; Bains, M. S.; Burt, M. American Journal of Roentgenology (1995)
Demas, B. E.; Heelan, R. T.; Lane, J.; Marcove, R.; Hajdu, S.; Brennan, M. F. American Journal of Roentgenology (1988)