More Groups
Fewer Groups
More People
Fewer People
Kim, S. H.; Garcia, C.; Rodriguez, J.; Coit, D. G. Journal of the American College of Surgeons (1999)
Reynolds, J. V.; Karpeh, M. S. Jr; Kelsen, D.; Hans, G.; Schwartz, G.; Garcia, C.; Rodriguez, J.; Newman, E.; Brennan, M. F. Gastroenterology (1995)